Eso.org - SEO Checker

Overview of the SEO Check
Meta information
80% 
Page quality
92% 
Page structure
94% 
Link structure
16% 
Server
84% 
External factors
100% 
SEO Score
Response time
2.04 s
File size
214.00 kB
Words
3205
Media files
23
Number of links
564 internal / 32 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
ESO
The page title is too short. (41 pixels of 580 max pixel length) Optimize title
The page title is only one word.
There are no duplicate words in the title
Meta description
(Critically important)
ESO, European Organisation for Astronomical Research in the Southern Hemisphere
The length of the meta description is perfect. (523 pixels out of 1000 max pixel length)
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
No canonical link is specified.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Server location: Germany
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
The specified alternate links have no errors.
Other meta tags
(Somewhat important)
There is no rel next meta tag on this page.
There is no rel prev meta tag on this page.
Domain
(Somewhat important)
The domain is no subdomain.
The domain length is good.
The domain does not contain non-latin characters.
Page URL
(Somewhat important)
No parameters were found in the URL.
No session ID was found in the URL.
The URL does not have too many subdirectories.
Charset encoding
(Somewhat important)
The charset encoding (UTF-8) is set correctly.
Doctype
(Nice to have)
The doctype HTML 5 is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width, initial-scale=1
robotsindex,follow
authorinformation@eso.org
descriptionESO, European Organisation for Astronomical Research in the Southern Hemisphere
keywordsESO, eso.org, Astronomy, Astrophysics, Astronomie, Suedsternwarte, telescopes, detectors, comets, planets, stars, galaxies, nebulae, universe, NTT, VLT, VLTI, ALMA, ELT, La Silla, Paranal, Garching, Chile
statvooVerificationf546f5bccd3fb7f8c5d8e97c6beab814
langen
twitter:cardsummary
twitter:site@ESO
twitter:creator@ESO
og:titleESO — The European Southern Observatory
og:descriptionWelcome to the most powerful astronomical observatories in the world.
og:imagehttps://cdn.eso.org/images/screen/uhd_yuri_alma_ant_cc.jpg
og:image:secure_urlhttps://cdn.eso.org/images/screen/uhd_yuri_alma_ant_cc.jpg
X-UA-CompatibleIE=edge
charsetutf-8

Automatically check eso.org including all subpages at once!

Try for free
Guaranteed free of charge during trial period.

Page quality

Content
(Critically important)
This page contains 3205 words. That's ok.
30.4% of the text are stop words.
The page contains a listing, which indicates a good text layout.
31 paragraphs were found on this page.
The text content is perfect.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 22.56 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
This page loads 4 JavaScript files. This may affect the load time negatively.
A viewport "width=device-width, initial-scale=1" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 64 tags for this page.
Image SEO
(Somewhat important)
2 images have no alt attribute. The content of alt attributes is used by search engines.
Social Networks
(Nice to have)
This page is optimized perfectly for social networks.
Additional markup
(Nice to have)
No additional page markup was found.
HTTPS
(Somewhat important)
This website uses HTTPS to protect privacy and integrity of the exchanged data.
All included files are also transferred via HTTPS.

Media list

URLAlt attributeTitle
cdn.eso.org/videos/small169/cs0018a.jpgTaking super sharp astronomical images with adaptive optics
...dn.eso.org/images/small169/potw2128a.jpgA cosmic rainbow over the VLT
...dn.eso.org/images/small169/potw2520a.jpgExciting skies above the ELT
...dn.eso.org/images/small169/potw2519a.jpgA volcanic sunrise
....org/images/small169/upr_IMG_6302-CC.jpgA journey through space & time
/public/archives/static/frontpage/elt.jpgThe World’s Biggest Eye on the Sky
/public/archives/static/frontpage/alma.jpgIn search of our Cosmic Origins
/public/archives/static/frontpage/vlt.jpgThe world’s most advanced visible-light astronomical observatory
...ic/archives/static/frontpage/lasilla.jpgESO’s first observatory
...mb350x/2018_04_17_es_moon-venus_4-cc.jpgNo alt attribute provided
...org/images/thumb350x/eso50_obs_compo.jpgNo alt attribute provided

Page structure

H1 heading
(Critically important)
Our Stories
The H1 heading is too short (11 characters). It should be at least 20 Characters long.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Our Stories
H1 Our Telescopes
H1 Visit Us
H1 Our use of Cookies
H1 ESO Cookies Policy
H2 What are cookies?
H2 Categories of cookies we use
H2 How to manage cookies
H2 Updates to the ESO Cookies Policy
H2 Additional information
There are too many internal links (564) on this page.
Some internal link anchor texts are too long.
Some internal links have dynamic parameters. All internal URLs, which are not marked as nofollow, should not contain dynamic parameters.
Some anchor texts are used more than once.
There are too many external links (32) on this page.
LinkAttributesAnchor text
https://www.eso.org/public/No Text
https://www.eso.org/public/?langInternational English
/public/denmark/?langDansk
/public/germany/?langDeutsch
/public/belgium-de/?langDeutsch (Belgien)
/public/switzerland-de/?langDeutsch (Schweiz)
/public/austria/?langDeutsch (Österreich)
/public/australia/?langEnglish (Australia)
/public/ireland/?langEnglish (Ireland)
/public/unitedkingdom/?langEnglish (UK)
/public/spain/?langEspañol
/public/chile/?langEspañol (Chile)
/public/france/?langFrançais
/public/belgium-fr/?langFrançais (Belgique)
/public/switzerland-fr/?langFrançais (Suisse)
/public/italy/?langItaliano
/public/switzerland-it/?langItaliano (Svizzera)
/public/netherlands/?langNederlands
/public/belgium-nl/?langNederlands (België)
/public/poland/?langPolski
/public/portugal/?langPortuguês
/public/finland/?langSuomi
/public/sweden/?langSvenska
/public/czechrepublic/?langČesky
https://www.eso.org/sci.htmlSubdomain Science
https://www.eso.org/UserPortal/User Portal
/public/outreach/newsletters/e...Subscribe
/public/about-eso/travel/Contact
/public/sitemap/Site Map
/public/about-eso/About
/public/about-eso/organisation/Organisation
/public/about-eso/mission-visi...Mission-Vision-Values-Strategy
/public/about-eso/dg-office/Director General
/public/about-eso/dg-office/pr...List of Directors General
/public/about-eso/dg-office/xb...Prof. Xavier Barcons
/public/about-eso/dg-office/td...Prof. T. de Zeeuw
/public/about-eso/dg-office/cc...Dr. C. Cesarsky
/public/about-eso/dg-office/rg...Prof. R. Giacconi
/public/about-eso/dg-office/hv...Prof. H. van der Laan
/public/about-eso/dg-office/lw...Prof. L. Woltjer
/public/about-eso/dg-office/ab...Prof. A. Blaauw
/public/about-eso/dg-office/ot...Prof. O. Heckmann
/public/about-eso/committees.htmlESO's Governing Bodies
/public/about-eso/memberstates/Member States and Partners
/public/about-eso/memberstates...Austria
/public/about-eso/memberstates...Belgium
/public/about-eso/memberstates...Czechia
/public/about-eso/memberstates...Denmark
/public/about-eso/memberstates...Finland
/public/about-eso/memberstates...France
/public/about-eso/memberstates...Germany
/public/about-eso/memberstates...Ireland
/public/about-eso/memberstates...Italy
/public/about-eso/memberstates...Netherlands
/public/about-eso/memberstates...Poland
/public/about-eso/memberstates...Portugal
/public/about-eso/memberstates...Spain
/public/about-eso/memberstates...Sweden
/public/about-eso/memberstates...Switzerland
/public/about-eso/memberstates...United Kingdom
/public/about-eso/strategicpar...Australia (Partner)
/public/about-eso/eso-and-chile/ESO & Chile
/public/about-eso/eso-and-chil...ESO Representation Office in Chile
/public/about-eso/travel/Travel and Contacts
/public/about-eso/travel/garch...Travel to ESO Headquarters
/public/about-eso/travel/vitac...Travel to Vitacura Office
/public/about-eso/travel/guest...Travel to Guesthouse
/public/about-eso/travel/lasilla/Travel to La Silla
/public/about-eso/travel/laser...Travel to La Serena
/public/about-eso/travel/paranal/Travel to Paranal
/public/about-eso/travel/antof...Travel to Antofagasta
/public/about-eso/travel/chajn...Travel to Chajnantor
/public/about-eso/travel/elt/Travel to ELT Armazones
/public/about-eso/visitors/Visits to ESO Sites
/public/about-eso/visitors/par...Weekend visits to Paranal
/public/about-eso/visitors/las...Weekend Visits to La Silla
/public/outreach/pressmedia/me...Media Visits
/public/about-eso/visitors/vir...Virtual Visits
/public/about-eso/visitors/art...Artistic Visits
/public/about-eso/societal-ben...ESO and Society
/public/about-eso/architecture/Architecture at ESO
/public/about-eso/collaborations/Collaborations with ESO
/public/about-eso/timeline/Timeline
/public/about-eso/sustainabili...Environmental sustainability at ESO
/public/about-eso/sustainabili...ESO and the UN's Sustainable Development Goals
/public/about-eso/sustainabili...Diversity, Equity and Inclusion
/public/about-eso/dark-skies-p...Dark skies preservation
/public/about-eso/privacy/Terms and Conditions
/public/images/Images
/public/images/search/Advanced Search
/public/images/archive/categor...360 Panorama
/public/images/archive/categor...ALMA
/public/images/archive/categor...APEX
/public/images/archive/categor...Chile
/public/images/archive/categor...Cosmology
/public/images/archive/categor...ELT
/public/images/archive/categor...ESO Supernova
/public/images/archive/categor...Exoplanets
/public/images/archive/categor...Fulldome
/public/images/archive/categor...Galaxies
/public/images/archive/categor...Galaxy Clusters
/public/images/archive/categor...Illustrations
/public/images/archive/categor...La Silla
/public/images/archive/categor...Nebulae
/public/images/archive/categor...Paranal
/public/images/archive/categor...People and Events
/public/images/archive/categor...Premises
/public/images/archive/categor...Quasars and Black Holes
/public/images/archive/categor...Solar System
/public/images/archive/categor...Star Clusters
/public/images/archive/categor...Stars
/public/images/archive/categor...Survey Telescopes
/public/images/comparisons/Image Comparisons
/public/images/imageformats/Image Formats
/public/images/potw/Picture of the Week
/public/images/potw/archive/ye...2025
/public/images/potw/archive/ye...2024
/public/images/potw/archive/ye...2023
/public/images/potw/archive/ye...2022
/public/images/potw/archive/ye...2021
/public/images/potw/archive/ye...2020
/public/images/potw/archive/ye...2019
/public/images/potw/archive/ye...2018
/public/images/potw/archive/ye...2017
/public/images/potw/archive/ye...2016
/public/images/potw/archive/ye...2015
/public/images/potw/archive/ye...2014
/public/images/potw/archive/ye...2013
/public/images/potw/archive/ye...2012
/public/images/potw/archive/ye...2011
/public/images/potw/archive/ye...2010
/public/images/potw/archive/ye...2009
/public/images/potw/archive/ye...2008
/public/images/potw/archive/ye...2007
/public/images/archive/top100/Top 100
https://cdn.eso.org/images/top...External Subdomain Large JPG Zip File (3.5 GB)
https://cdn.eso.org/images/top...External Subdomain Original TIF Zip File (50 GB)
/public/copyright/Usage of ESO Images and Videos
/public/images/archive/wallpap...Wallpapers
/public/images/archive/zoomable/Zoomable
/public/videos/Videos
/public/videos/search/Text duplicate Advanced Search
/public/videos/archive/categor...About ESO
/public/videos/archive/categor...Text duplicate ALMA
/public/videos/archive/categor...Text duplicate APEX
/public/videos/archive/categor...Chasing Starlight
/public/videos/archive/categor...Compilations
/public/videos/archive/categor...Text duplicate Cosmology
/public/videos/archive/categor...Text duplicate ELT
/public/videos/archive/categor...ESOcast
/public/videos/archive/categor...Events
/public/videos/archive/categor...Text duplicate Exoplanets
/public/videos/archive/categor...Feature Movies
/public/videos/archive/categor...Text duplicate Fulldome
/public/videos/archive/categor...Text duplicate Galaxies
/public/videos/archive/categor...Text duplicate Galaxy Clusters
/public/videos/archive/categor...Text duplicate La Silla
/public/videos/archive/categor...Text duplicate Nebulae
/public/videos/archive/categor...Text duplicate Paranal
/public/videos/archive/categor...Text duplicate Premises
/public/videos/archive/categor...Text duplicate Quasars and Black Holes
/public/videos/archive/categor...Text duplicate Solar System
/public/videos/archive/categor...Text duplicate Star Clusters
/public/videos/archive/categor...Text duplicate Stars
/public/videos/archive/categor...Video News Releases
/public/copyright/Usage of ESO Videos and Images
/public/videoformats/Video Formats
https://www.eso.org/public/news/News
https://www.eso.org/public/news/Press Releases
/public/news/archive/year/2025/Text duplicate 2025
/public/news/archive/year/2024/Text duplicate 2024
/public/news/archive/year/2023/Text duplicate 2023
/public/news/archive/year/2022/Text duplicate 2022
/public/news/archive/year/2021/Text duplicate 2021
/public/news/archive/year/2020/Text duplicate 2020
/public/news/archive/year/2019/Text duplicate 2019
/public/news/archive/year/2018/Text duplicate 2018
/public/news/archive/year/2017/Text duplicate 2017
/public/news/archive/year/2016/Text duplicate 2016
/public/news/archive/year/2015/Text duplicate 2015
/public/news/archive/year/2014/Text duplicate 2014
/public/news/archive/year/2013/Text duplicate 2013
/public/news/archive/year/2012/Text duplicate 2012
/public/news/archive/year/2011/Text duplicate 2011
/public/news/archive/year/2010/Text duplicate 2010
/public/news/archive/year/2009/Text duplicate 2009
/public/news/archive/year/2008/Text duplicate 2008
/public/news/archive/year/2007/Text duplicate 2007
/public/news/archive/year/2006/2006
/public/news/archive/year/2005/2005
/public/news/archive/year/2004/2004
/public/news/archive/year/2003/2003
/public/news/archive/year/2002/2002
/public/news/archive/year/2001/2001
/public/news/archive/year/2000/2000
/public/news/archive/year/1999/1999
/public/news/archive/year/1998/1998
/public/news/archive/year/1997/1997
/public/news/archive/year/1996/1996
/public/news/archive/year/1995/1995
/public/news/archive/year/1994/1994
/public/news/archive/year/1993/1993
/public/news/archive/year/1992/1992
/public/news/archive/year/1991/1991
/public/news/archive/year/1990/1990
/public/news/archive/year/1989/1989
/public/news/archive/year/1988/1988
/public/news/archive/year/1987/1987
/public/news/archive/year/1986/1986
/public/news/archive/year/1985/1985
/public/announcements/Announcements
/public/announcements/archive/...Text duplicate 2025
/public/announcements/archive/...Text duplicate 2024
/public/announcements/archive/...Text duplicate 2023
/public/announcements/archive/...Text duplicate 2022
/public/announcements/archive/...Text duplicate 2021
/public/announcements/archive/...Text duplicate 2020
/public/announcements/archive/...Text duplicate 2019
/public/announcements/archive/...Text duplicate 2018
/public/announcements/archive/...Text duplicate 2017
/public/announcements/archive/...Text duplicate 2016
/public/announcements/archive/...Text duplicate 2015
/public/announcements/archive/...Text duplicate 2014
/public/announcements/archive/...Text duplicate 2013
/public/announcements/archive/...Text duplicate 2012
/public/announcements/archive/...Text duplicate 2011
/public/announcements/archive/...Text duplicate 2010
/public/announcements/archive/...Text duplicate 2009
https://www.eso.org/public/blog/Subdomain ESOblog
/public/announcements/webupdates/New on eso.org
/public/outreach/pressmedia/Press Room
/public/outreach/broadcast/Broadcast Services
/public/outreach/pressmedia/me...Text duplicate Media Visits
/public/copyright/Copyright Notice
/public/newsletters/ESO Newsletters
/public/news/pitch-your-research/Pitch your Research
https://www.eso.org/public/shop/ESOshop
/public/shop/category/Shop Products
/public/shop/category/annualre...Annual Reports
/public/shop/category/apparel/Apparel
/public/shop/category/book/Books
/public/shop/category/brochure/Brochures
/public/shop/category/calendar/Calendars
/public/shop/category/capjournal/CAPjournals
/public/shop/category/conferen...Conferences
/public/shop/category/media/DVDs/Bluray/CDs
/public/shop/category/educatio...Educational Material
/public/shop/category/supernov...ESO Supernova Activities
/public/shop/category/flyer/Flyers
/public/shop/category/handout/Handouts
/public/shop/category/map/Maps
/public/shop/category/merchand...Merchandise
/public/shop/category/mountedi...Mounted Images
/public/shop/category/postcard/Postcards
/public/shop/category/printedp...Posters
/public/shop/category/technica...Reports
/public/shop/category/sticker/Stickers
/public/shop/cart/View shopping cart
/public/shop/checkout/Checkout
/public/shopinfo/Information
/public/shopinfo/bulk_orders/Bulk Orders
/public/shopinfo/Purchasing Steps
/public/shopinfo/payment/Payment
/public/shopinfo/shipping/Shipping
/public/shopinfo/shopstaff/Staff Shopping
/public/shopinfo/terms/Terms & Conditions
/public/shop/freeorder/Free Orders for Educators and Media
/public/teles-instr/Telescopes & Instruments
/public/teles-instr/paranal-ob...Paranal Observatory
/public/teles-instr/paranal-ob...Very Large Telescope
/public/teles-instr/paranal-ob...VLT Instruments
/public/teles-instr/paranal-ob...4LGSF
/public/teles-instr/paranal-ob...CUBES
/public/teles-instr/paranal-ob...CRIRES
/public/teles-instr/paranal-ob...CRIRES+
/public/teles-instr/paranal-ob...ESPRESSO
/public/teles-instr/paranal-ob...ERIS
/public/teles-instr/paranal-ob...FLAMES
/public/teles-instr/paranal-ob...FORS1 and FORS2
/public/teles-instr/paranal-ob...HAWK-I
/public/teles-instr/paranal-ob...ISAAC
/public/teles-instr/paranal-ob...KMOS
/public/teles-instr/paranal-ob...MAD
/public/teles-instr/paranal-ob...MAVIS
/public/teles-instr/paranal-ob...MOONS
/public/teles-instr/paranal-ob...MUSE
/public/teles-instr/paranal-ob...NACO
/public/teles-instr/paranal-ob...SINFONI
/public/teles-instr/paranal-ob...SPHERE
/public/teles-instr/paranal-ob...UVES
/public/teles-instr/paranal-ob...VIMOS
/public/teles-instr/paranal-ob...VLT Test Cameras
/public/teles-instr/paranal-ob...VISIR
/public/teles-instr/paranal-ob...X-shooter
/public/teles-instr/paranal-ob...VLT Unit Telescopes Names
/public/teles-instr/paranal-ob...Antu
/public/teles-instr/paranal-ob...Kueyen
/public/teles-instr/paranal-ob...Melipal
/public/teles-instr/paranal-ob...Yepun
/public/teles-instr/paranal-ob...VLT Interferometer
/public/teles-instr/paranal-ob...GRAVITY+
/public/teles-instr/paranal-ob...GRAVITY
/public/teles-instr/paranal-ob...MATISSE
/public/teles-instr/paranal-ob...NAOMI
/public/teles-instr/paranal-ob...PIONIER
/public/teles-instr/paranal-ob...AMBER
/public/teles-instr/paranal-ob...MIDI
/public/teles-instr/paranal-ob...VINCI
/public/teles-instr/paranal-ob...Auxiliary Telescopes
/public/teles-instr/paranal-ob...Text duplicate Survey Telescopes
/public/teles-instr/paranal-ob...VISTA
/public/teles-instr/paranal-ob...The VISTA mirror
/public/teles-instr/paranal-ob...VIRCAM
/public/teles-instr/paranal-ob...4MOST
/public/teles-instr/paranal-ob...The VISTA surveys
/public/teles-instr/paranal-ob...The VISTA consortium
/public/teles-instr/paranal-ob...VST
/public/teles-instr/paranal-ob...The VST mirrors
/public/teles-instr/paranal-ob...OmegaCAM
/public/teles-instr/paranal-ob...The VST surveys
/public/teles-instr/paranal-ob...SPECULOOS
/public/teles-instr/paranal-ob...NGTS
/public/teles-instr/paranal-ob...Cherenkov Telescope Array Observatory
/public/teles-instr/lasilla/La Silla Observatory
/public/teles-instr/lasilla/sw...Swedish–ESO Submillimetre Telescope
/public/teles-instr/lasilla/sw...SIMBA
/public/teles-instr/lasilla/ntt/New Technology Telescope
/public/teles-instr/lasilla/nt...EFOSC2
/public/teles-instr/lasilla/nt...EMMI
/public/teles-instr/lasilla/nt...IRSPEC
/public/teles-instr/lasilla/nt...SOFI
/public/teles-instr/lasilla/nt...SOXS
/public/teles-instr/lasilla/nt...SUSI and SUSI2
/public/teles-instr/lasilla/36/ESO 3.6-metre telescope
/public/teles-instr/lasilla/36...ADONIS
/public/teles-instr/lasilla/36...CASPEC
/public/teles-instr/lasilla/36...Text duplicate IRSPEC
/public/teles-instr/lasilla/36...HARPS
/public/teles-instr/lasilla/36...MEFOS
/public/teles-instr/lasilla/36...NIRPS
/public/teles-instr/lasilla/36...OPTOPUS
/public/teles-instr/lasilla/36...TIMMI/2
/public/teles-instr/lasilla/36...Infrared Photometer/Spectrophotometer
/public/teles-instr/lasilla/36...Standard Photometer
/public/teles-instr/lasilla/36...Infrared Specklegraph
/public/teles-instr/lasilla/36...Infrared Speckle Interferometer
/public/teles-instr/lasilla/36...EFOSC
/public/teles-instr/lasilla/mp...MPG/ESO 2.2-metre telescope
/public/teles-instr/lasilla/mp...FEROS
/public/teles-instr/lasilla/mp...GROND
/public/teles-instr/lasilla/mp...IRAC & IRAC2
/public/teles-instr/lasilla/mp...PISCO
/public/teles-instr/lasilla/mp...WFI
/public/teles-instr/lasilla/mp...Text duplicate Infrared Photometer/Spectrophotometer
/public/teles-instr/lasilla/sw...Swiss 1.2-metre Leonhard Euler Telescope
/public/teles-instr/lasilla/sw...CORALIE
/public/teles-instr/lasilla/rem/Rapid Eye Mount telescope
/public/teles-instr/lasilla/tr...TRAnsiting Planets and PlanetesImals Small Telescope–South
/public/teles-instr/lasilla/da...Danish 1.54-metre telescope
/public/teles-instr/lasilla/da...CORAVEL
/public/teles-instr/lasilla/da...DFOSC
/public/teles-instr/lasilla/da...CCD camera
/public/teles-instr/lasilla/da...Hβ Photometer
/public/teles-instr/lasilla/da...Two-Channel Photometer
/public/teles-instr/lasilla/da...Four-Channel Photometer
/public/teles-instr/lasilla/da...Six-Channel uvby-Hβ Photometer
/public/teles-instr/lasilla/ta...Télescope à Action Rapide pour les Objets Transitoires
/public/teles-instr/lasilla/1m...ESO 1-metre Schmidt telescope
/public/teles-instr/lasilla/15...ESO 1.52-metre telescope
/public/teles-instr/lasilla/15...Boller and Chivens Spectrograph
/public/teles-instr/lasilla/15...Coudé Spectrograph
/public/teles-instr/lasilla/15...ECHELEC
/public/teles-instr/lasilla/15...RV Cass Spectrograph
/public/teles-instr/lasilla/1m...ESO 1-metre telescope
/public/teles-instr/lasilla/1m...FIDEOS
/public/teles-instr/lasilla/1m...Infrared Photometer
/public/teles-instr/lasilla/1m...Single-Channel Photometer
/public/teles-instr/lasilla/05...ESO 0.5-metre telescope
/public/teles-instr/lasilla/05...Text duplicate Single-Channel Photometer
/public/teles-instr/lasilla/05...Double-Channel Photometer
/public/teles-instr/lasilla/co...Coudé Auxiliary Telescope
/public/teles-instr/lasilla/co...CES
/public/teles-instr/lasilla/ma...MarLy 1-metre telescope
/public/teles-instr/lasilla/09...Dutch 0.9-metre telescope
/public/teles-instr/lasilla/09...Walraven Photometer
/public/teles-instr/lasilla/t70/Swiss T70 telescope
/public/teles-instr/lasilla/bo...Bochum 0.61-metre telescope
/public/teles-instr/lasilla/bo...Bochum Scanner
/public/teles-instr/lasilla/bo...Bochum Photometer
/public/teles-instr/lasilla/da...Danish 0.5-metre telescope
/public/teles-instr/lasilla/da...Two-Channel Hβ Photometer
/public/teles-instr/lasilla/da...Four-Channel uvby Photometer
/public/teles-instr/lasilla/da...Six-Channel uvby–Hβ Photometer
/public/teles-instr/lasilla/gpo/Grand Prisme Objectif telescope
/public/teles-instr/lasilla/sw...Swiss 0.4-metre telescope
/public/teles-instr/lasilla/ma...Marseille 0.36-metre telescope
/public/teles-instr/lasilla/grb/GRB Monitoring System
/public/teles-instr/lasilla/ma...MASCARA
/public/teles-instr/lasilla/bl...BlackGEM
/public/teles-instr/lasilla/ex...ExTrA
/public/teles-instr/lasilla/te...Test-Bed Telescope
/public/teles-instr/apex/Text duplicate APEX
/public/teles-instr/apex/apex-2a/APEX–2A
/public/teles-instr/apex/artemis/ArTéMiS
/public/teles-instr/apex/aszca/ASZCa
/public/teles-instr/apex/champ...CHAMP+
/public/teles-instr/apex/conce...CONCERTO
/public/teles-instr/apex/flash/FLASH
/public/teles-instr/apex/flash...FLASH+
/public/teles-instr/apex/laboca/LABOCA
/public/teles-instr/apex/mpi_1...MPI_1.1THz
/public/teles-instr/apex/p-art...P-ArTéMiS
/public/teles-instr/apex/pi230/PI230
/public/teles-instr/apex/polka/PolKa
/public/teles-instr/apex/saboca/SABOCA
/public/teles-instr/apex/sepia/SEPIA
/public/teles-instr/apex/shefi/SHeFI
/public/teles-instr/alma/Text duplicate ALMA
/public/teles-instr/alma/anten...Antennas
/public/teles-instr/alma/trans...Transporters
/public/teles-instr/alma/inter...Interferometry
/public/teles-instr/alma/recei...Receiver Bands
/public/teles-instr/alma/resid...ALMA Residencia
/public/teles-instr/elt/Text duplicate ELT
/public/teles-instr/technology/Technology for Telescopes
/public/teles-instr/technology...Active Optics
/public/teles-instr/technology...Adaptive Optics
/public/teles-instr/technology...Integral Field Units
/public/teles-instr/technology...Text duplicate Interferometry
/public/teles-instr/technology...Spectroscopy
/public/teles-instr/technology...Polarimetry
/public/teles-instr/instruments/Instruments
/public/science/Discoveries
/public/science/key-discoveries/ESO Key Astronomical Discoveries
/public/science/exoplanets/Text duplicate Exoplanets
/public/science/gravitationalw...Gravitational Wave Sources
/public/science/event-horizon/Subdomain First image of a black hole
/public/science/EHT-MilkyWay/Subdomain First image of the Milky Way central black hole
/public/science/gc/Subdomain More about the black hole at the galactic centre
/public/science/grb/Gamma-Ray Bursts
/public/science/archive/Science Archive
/public/events/Text duplicate Events
/public/events/press-evt/Press Events
/public/events/special-evt/Special Events
/public/events/special-evt/60y...Subdomain ESO at 60
/public/events/special-evt/eel...ELT Groundbreaking
/public/events/special-evt/caf...Café & Kosmos in Munich
/public/events/special-evt/awe...Awesome Universe
/public/events/special-evt/100ha/100 Hours of Astronomy
/public/events/special-evt/the...The Eye 3D
/public/events/special-evt/ima...IMAX® 3D Film Hidden Universe
/public/outreach/bond/Bond at Paranal
/public/events/exhibitions/Exhibitions
/public/events/exhibitions/per...ESO Permanent Exhibitions
https://www.esof.eu/External Subdomain EuroScience Open Forum (ESOF)
/public/events/astro-evt/Astronomical Events
/public/events/astro-evt/solar...Total Solar Eclipse 2019
/public/events/astro-evt/mcnau...The Comet McNaught 2007
/public/events/astro-evt/deepi...Deep Impact - 04.07.2005
/public/outreach/eduoff/vt-2004/Subdomain The Venus Transit - 08.11.2004
/public/events/astro-evt/leoni...The Leonids - 17.11.1999
/public/events/astro-evt/eclip...Solar Eclipse at ESO HQ - 11.08.1999
/public/events/astro-evt/leoni...The Leonids - 11.1998
/public/events/astro-evt/pathf...Mars Pathfinder - 1997
/public/events/astro-evt/hyaku...Comet Hyakutake - 1997
/public/events/astro-evt/sl9/SL-9 and Jupiter - 1994
/public/events/astro-evt/hale-...Comet Hale Bopp - 1994
/public/outreach/Outreach
/public/outreach/eduoff/Education
/public/products/education/Text duplicate Educational Material
/public/outreach/eduoff/teache...Teacher Schools
/public/outreach/eduoff/prev-p...Previous Programmes
/public/outreach/eduoff/prev-p...Subdomain Catch a Star
/public/outreach/eduoff/liu/Life in the Universe
/public/outreach/eduoff/pos/Physics On Stage
http://kids.alma.cl/?lang=enExternal Subdomain ALMA Kids
/public/outreach/partnerships/Partnerships
/public/outreach/partnerships/...Volunteer Translators
/public/outreach/partnerships/...ESO Science Outreach Network
/public/outreach/partnerships/...ESO Outreach Partner Organisations
/public/outreach/partnerships/...Informal Educators
/public/outreach/partnerships/...ESO Photo Ambassadors
/public/outreach/partnerships/...ESO Music Ambassadors
/public/outreach/first-picture...Subdomain Taking the First Picture of a Black Hole
/public/outreach/gems/Cosmic Gems
/public/outreach/social/Social Media
/public/outreach/for_planetari...For Planetariums
/public/outreach/webcams/Subdomain Webcams
/public/outreach/your_eso_pict...Your ESO Pictures
/public/outreach/astroprize/European Astronomy Journalism Prize
/public/outreach/department/Our Team
/public/outreach/department/st...Students and Visitors
https://supernova.eso.org/join...External Subdomain Join us
https://supernova.eso.org/External Subdomain Text duplicate ESO Supernova
/public/outreach/data2dome/Data2Dome
https://www.eso.org/public/blog/Subdomain Text duplicate ESOblog
/public/outreach/starsateso/Stars@ESO
/public/outreach/ai-disclaimer/AI Disclaimer
/public/products/Products
/public/products/models3d/3D models
/public/products/minisites/Mini-sites
/public/products/music/Music
/public/products/planetariumsh...Planetarium shows
/public/products/presentations/Presentations
/public/products/soundscapes/Soundscapes
/public/products/virtualbackgr...Subdomain Virtual Backgrounds
/public/products/virtualtours/Virtual Tours
/public/products/annualreports/Text duplicate Annual Reports
/public/products/books/Text duplicate Books
/public/products/brochures/Text duplicate Brochures
/public/products/calendars/Text duplicate Calendars
/public/products/flyers/Text duplicate Flyers
/public/products/maps/Text duplicate Maps
/public/products/presskits/Press kits
/public/products/postcards/Text duplicate Postcards
/public/products/stickers/Text duplicate Stickers
/public/products/print_posters/Printed posters
/public/products/papermodels/Paper models
/public/products/merchandise/Text duplicate Merchandise
/public/products/merchandise/Text duplicate Merchandise
/public/products/apparel/Text duplicate Apparel
/public/products/mountedimages/Mounted images
/public/products/elec_posters/Electronic posters
/public/products/virtualbackgr...Subdomain Text duplicate Virtual Backgrounds
/public/products/exhibitions/Exhibition material
/public/products/logos/Logos
https://www.eso.org/public/shop/Order in ESOshop
/public/industry/Business@ESO
/public/industry/cp.htmlProcurement at ESO
/public/industry/events/Subdomain Industry Events
/public/industry/techtrans/Technology Transfer
/public/industry/techtrans/tec...Technology Developed by Industries
/public/industry/techtrans/dev...Novel technologies by ESO
/public/industry/techtrans/dev...ESO know-how
/public/industry/projects/Projects
/public/industry/contact/Contact Information
https://recruitment.eso.org/External Subdomain Career Opportunities
https://recruitment.eso.org/External Subdomain Recruitment
/public/jobs/conditions/Employment Conditions
/public/jobs/conditions/intstaff/International Staff Members
/public/jobs/conditions/locals...Local Staff Members (Spanish / English)
/public/jobs/conditions/fellows/Fellows
/public/jobs/conditions/students/Students
/public/jobs/conditions/paidas...Paid Associates
/public/jobs/working-at-eso/Working at ESO
/public/jobs/other-information/Other Information
https://www.eso.org/public/European Southern Observatory
/public/news/eso2508/eso2508 — Press Release "Big surprise": astronomers find planet in perpendicular orbit around pair of stars Astronomers have found a planet that orbits at an...
IMG-ALT 2M1510 (AB) b, a planet in a perpendicular orbit around two brown dwarfs
/public/announcements/ann25002/ann25002 Celebrations held as dome of ESO’s Extremely Large Telescope reaches its peak
IMG-ALT Reaching the top of the ELT dome
/public/news/eso2507/eso2507 — Press Release Oxygen discovered in most distant known galaxy Two different teams of astronomers have detected oxygen in the most distant known gala...
IMG-ALT Furthest detection of oxygen in the early Universe
/public/news/eso2506/eso2506 — Press Release New ESO analysis confirms severe damage from industrial complex planned near Paranal An in-depth technical analysis by the European S...
IMG-ALT A cosmic rainbow over the VLT
/public/announcements/ann25001/ann25001 Telescope first light for ESO’s Extremely Large Telescope now planned for March 2029
IMG-ALT At the summit of Cerro Armazones
/public/news/eso2505/eso2505 — Press Release ESO observations help almost fully rule out 2024 YR4 asteroid impact New observations of 2024 YR4 conducted with the European Souther...
IMG-ALT Asteroid 2024 YR4 observed with ESO’s Very Large Telescope
/public/news/eso2504/eso2504 — Press Release “Out of science fiction”: First 3D observations of an exoplanet’s atmosphere reveal a unique climate Astronomers have peered through ...
IMG-ALT The 3D structure of the atmosphere of the exoplanet Tylos
/public/news/eso2503/eso2503 — Press Release Star cluster reveals its colours in stunning 80-million-pixel ESO image The European Southern Observatory (ESO) has released a stunni...
IMG-ALT The RCW 38 cluster in infrared light
/public/news/eso2502/eso2502 — Press Release Extreme supersonic winds measured on planet outside our Solar System Astronomers have discovered extremely powerful winds pummeling t...
IMG-ALT Artist’s impression of supersonic winds on WASP-127b
/public/news/eso2501/eso2501 — Press Release World's darkest and clearest skies at risk from industrial megaproject On December 24th, AES Andes, a subsidiary of the US power comp...
IMG-ALT Touching the Arc of Space
/public/news/eso2418/eso2418 — Press Release First ever binary star found near our galaxy’s supermassive black hole An international team of researchers has detected a binary sta...
IMG-ALT Location of binary star D9 in the Milky Way
/public/news/eso2417/eso2417 — Press Release Astronomers take the first close-up picture of a star outside our galaxy “For the first time, we have succeeded in taking a zoomed-in...
IMG-ALT Image of the star WOH G64 taken by the VLTI
https://www.eso.org/public/Text duplicate European Southern Observatory
/public/videos/cs0018a/Video 9 May 2025 — cs0018a Taking super sharp astronomical images with adaptive optics
IMG-ALT Taking super sharp astronomical images with adaptive optics
/public/news/eso2506/Press Release 17 Mar 2025 — eso2506 New ESO analysis confirms severe damage from industrial complex planned near Paranal
IMG-ALT A cosmic rainbow over the VLT
/public/images/potw2520a/Picture of the Week 19 May 2025 — potw2520 Exciting skies above the ELT
IMG-ALT Exciting skies above the ELT
/public/images/potw2519a/Picture of the Week 12 May 2025 — potw2519 A volcanic sunrise
IMG-ALT A volcanic sunrise
/public/blog/100-years-of-plan...Blog Post 9 May 2025 — 100-years-of-planetaria 100 years of planetaria
IMG-ALT A journey through space & time
/public/teles-instr/e-elt/Text duplicate ELT
IMG-ALT The World’s Biggest Eye on the Sky
/public/teles-instr/alma/Text duplicate ALMA
IMG-ALT In search of our Cosmic Origins
/public/teles-instr/paranal/VLT
IMG-ALT The world’s most advanced visible-light astronomical observatory
/public/teles-instr/lasilla/LA SILLA
IMG-ALT ESO’s first observatory
https://supernova.eso.org/External Subdomain Text duplicate ESO Supernova
/public/about-eso/visitors/Subdomain Observatories
https://facebook.com/ESOAstronomyExternal No Text
https://www.threads.net/@esoas...New window External Subdomain No Text
https://www.instagram.com/esoa...New window External Subdomain No Text
https://www.flickr.com/photos/...New window External Subdomain No Text
https://www.youtube.com/ESOObs...New window External Subdomain No Text
https://www.linkedin.com/compa...New window External Subdomain No Text
https://podcasts.apple.com/us/...New window External Subdomain No Text
https://www.scribd.com/ESO_pub...New window External Subdomain No Text
https://www.whatsapp.com/chann...New window External Subdomain No Text
https://bsky.app/profile/eso.orgNew window External No Text
https://astrodon.social/@esoas...New window External No Text
/public/outreach/newsletters/e...Subscribe to receive news from ESO in your language
https://www.cdn77.com/External Subdomain Accelerated by CDN77
/public/about-eso/privacy/Text duplicate Terms & Conditions
https://www.youtube.com/t/termsNew window External Subdomain YouTube
https://www.youtube.com/channe...New window External Subdomain ESO’s official YouTube channel
https://support.google.com/you...New window External Subdomain embedding videos information page
https://support.brave.com/hc/e...New window External Subdomain Brave
https://support.google.com/chr...New window External Subdomain Chrome
https://support.microsoft.com/...New window External Subdomain Edge
https://support.mozilla.org/en...New window External Subdomain Firefox
https://docs.info.apple.com/ar...New window External Subdomain Safari
https://www.facebook.com/share...New window External Subdomain No Text
https://twitter.com/intent/twe...New window External No Text
https://pinterest.com/pin/crea...New window External No Text

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.eso.org/public/"
HTTP header
(Important)
The web server version is sent within the HTTP header.
No X-Powered HTTP header is sent.
The web server transmits the web page (HTML) in compressed form.
Performance
(Somewhat important)
The page response time is very slow (2.04 seconds). The response time should be less than 0.4 seconds. Slow websites are bad for search engine bots and also result in bad user experience.
This page loads 4 JavaScript files. This may affect the load time negatively.
This page only loads 2 CSS files. That's ok.
The file size of the HTML document is fine (214 kB).

HTTP Response Header

NameValue
servernginx/1.20.1
dateTue, 20 May 2025 02:15:04 GMT
content-typetext/html; charset=utf-8
content-length35493
connectionkeep-alive
content-languageen
content-encodinggzip
varyCookie, Accept-Encoding
etagW/"0d8037515daaf28873dee537f05f6533"
set-cookie139 Characters
access-control-allow-origin*
access-control-request-method*
strict-transport-securitymax-age=60;
statuscode200
http_versionHTTP/1.1

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 1,105 referring domains.
This page has 11,772 backlinks.
This page has backlinks from 951 different ip addresses.

Robots.txt

# $Id: robots.txt,v 1.19 2017/05/23 17:35:51 web Exp web $
# robots.txt for http://www.eso.org/

User-agent: *

# CQ start
Disallow: /libs
Disallow: /apps
# CQ end
Disallow: /sci/php/redirect.html
Disallow: /public/redirect.html
Disallow: /intra/redirect.html
Disallow: /images/staff
Disallow: /sci/activities/projects/eis/bin
Disallow: /secure
Disallow: /casalma
Disallow: /almaaqua
Disallow: /wiki
Disallow: /projects/alma/arc/tw
#Disallow: /bin/getphone
Disallow: /*confidential/*
Disallow: /public/about-eso/committees/cou
Disallow: /public/about-eso/committees/cc
Disallow: /public/about-eso/committees/fc
Disallow: /public/about-eso/committees/opc
Disallow: /public/about-eso/committees/stc
Disallow: /public/about-eso/committees/uc
Disallow: /public/about-eso/committees/vc
Disallow: /projects/esocal/cs/
Disallow: /projects/esocal/esocal
#TWikis
Disallow: /*/bin/WebSearch
Disallow: /*/bin/WebChanges
Disallow: /*/bin/WebNotify
Disallow: /*/bin/login
Disallow: /*/bin/attach
Disallow: /*/bin/changes
Disallow: /*/bin/configure
Disallow: /*/bin/edit
Disallow: /*/bin/geturl
Disallow: /*/bin/installpasswd
Disallow: /*/bin/login
Disallow: /*/bin/logon
Disallow: /*/bin/logos
Disallow: /*/bin/mailnotify
Disallow: /*/bin/manage
Disallow: /*/bin/oops
Disallow: /*/bin/passwd
Disallow: /*/bin/preview
Disallow: /*/bin/rdiff
Disallow: /*/bin/rdiffauth
Disallow: /*/bin/register
Disallow: /*/bin/rename
Disallow: /*/bin/resetpasswd
Disallow: /*/bin/rest
Disallow: /*/bin/save
Disallow: /*/bin/savemulti
Disallow: /*/bin/search
Disallow: /*/bin/setlib.cfg
Disallow: /*/bin/statistics
Disallow: /*/bin/testenv
Disallow: /*/bin/twiki
Disallow: /*/bin/upload
Disallow: /*/bin/viewauth
Disallow: /*/bin/viewfile

# icons etc
# Disallow: /gif/                   
# Disallow: /icons/                 
# Disallow: /images/                

# too many files
Disallow: /it/facilities/Unixhelp 
Disallow: /it/manuals             
Disallow: /it/scisoft/star   
Disallow: /observing/dfo/status

# internal
Disallow: /projects/alma/faqs     
Disallow: /webproject/
Disallow: /sci/facilities/paranal/sciops/team_only/
Disallow: /paranal/sciops/team_only/
Disallow: /2007/intra
Disallow: /intra
Disallow: /sdd

# other
User-agent: WebCopier
Disallow: /

# Yahoo
User-agent: puf
Disallow: /

Search preview

www.eso.org › public
ESO
ESO, European Organisation for Astronomical Research in the Southern Hemisphere

Most important keywords

Following keywords were found. You can check the keyword optimization of this page for each keyword.

KeywordResultRecheck
delete or56%Check
Astronomical48%Check
Astronomical Research47%Check
European46%Check
Southern46%Check
Organisation46%Check
Research46%Check
European Southern46%Check
European Organisation46%Check
Southern Hemisphere46%Check

Automatically check eso.org including all subpages at once!

Try for free
Guaranteed free of charge during trial period.

Cookie Policy

We use cookies to make our site work and also for analytics and advertising purposes. You can enable or disable optional cookies as desired. See the following links for more information.

We need these so the site can function properly

So we can better understand how visitors use our website

So we can serve you tailored ads and promotions