Imagine.gsfc.nasa.gov - SEO Checker

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Overview of the SEO Check
Meta information
84% 
Page quality
58% 
Page structure
100% 
Link structure
80% 
Server
22% 
External factors
100% 
SEO Score
Response time
0.90 s
File size
11.70 kB
Words
421
Media files
11
Number of links
67 internal / 12 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Imagine the Universe!
The page title is too short. (196 pixels of 580 max pixel length) Optimize title
There are no duplicate words in the title
Meta description
(Critically important)
This site is intended for students age 14 and up, and for anyone interested in learning about our universe.
The length of the meta description is perfect. (646 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: United States of America
The following language is defined by HTML: en
Alternate/Hreflang Links
(Somewhat important)
There are no alternate links specified on this page.
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)
This page is hosted on a subdomain. Use a top level domain for better SEO results.
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)
HTTP-Header Content-Type: iso-8859-1
Meta Charset Attribut: utf-8
The specified character encodings are different.
Doctype
(Nice to have)
No doctype markup was found.
Favicon
(Nice to have)
The favicon is linked correctly.

Meta tags

NameValue
titleImagine the Universe!
descriptionThis site is intended for students age 14 and up, and for anyone interested in learning about our universe.
keywordsimagine the universe, nasa, education, ask an astrophysicist, lesson plans, educator guides, active galactic nuclei, astronomy, binary stars, black holes, cataclysmic variables, comets, cosmic rays, cosmos, dark matter, diffuse background, earth, galaxies, gamma-ray bursts, gravitational waves, neutron stars, pulsars, quasars, space, stars, sun, supernova, supernova remnants, universe, white dwarfs
robotsnoodp
orgcode660
content-ownerJohn.D.Myers.1
webmasterStephan.F.Fantasia.1
rnoPhillip.A.Newman.1
viewportwidth=device-width, initial-scale=1, maximum-scale=1
langen
charsetutf-8

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Page quality

Content
(Critically important)
Words from the H1 heading are not used in the page content.
There are only 421 words on this page. Good pages should have about 800 words of useful content.
28.7% of the text are stop words.
The page contains a listing, which indicates a good text layout.
7 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 19.58 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
A viewport "width=device-width, initial-scale=1, maximum-scale=1" is provided.
This page only loads 1 JavaScript files. That's good!
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 8 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
Social Networks
(Nice to have)
There are only a few social sharing widgets on the page. Make your website popular in social networks with social sharing widgets.
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
/includes/img/nasa_insignia.pngNASA Insignia
/includes/img/hamburger_menu_icon.pngMenu
/includes/img/imagine_banner.pngImagine the Universe!
/includes/img/imagine_logo.pngImagine the Universe!
https://imagine.gsfc.nasa.gov/feat_01.jpgWe've Expanded Our Coloring Pages
https://imagine.gsfc.nasa.gov/feat_02.jpgAfterschool Universe is Now Hosted on Imagine the Universe
https://imagine.gsfc.nasa.gov/feat_03.jpgCosmic Times is Now Hosted on Imagine the Universe
https://imagine.gsfc.nasa.gov/feat_04.jpgStars exploding? Who would do such a thing?
https://imagine.gsfc.nasa.gov/feat_05.jpgFeatured Scientist: Dr. Marc Kuchner
/includes/img/nasa_insignia.pngNASA Insignia
/includes/img/goddardsignature.pngGoddard Signature

Page structure

H1 heading
(Critically important)
National Aeronautics and Space Administration
The H1 heading is perfect.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 National Aeronautics and Space Administration
H2 Goddard Space Flight Center
H2 Latest Features
H3 We've Expanded Our Coloring Pages
H3 Afterschool Universe is Now Hosted on Imagine the Universe
H3 Cosmic Times is Now Hosted on Imagine the Universe
H3 Stars exploding? Who would do such a thing?
H3 Featured Scientist: Dr. Marc Kuchner
Some anchor texts are used more than once.
The number of internal links is ok.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 12 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://imagine.gsfc.nasa.gov/Anchor Skip navigation and go straight to page content.
https://www.nasa.gov/External Subdomain IMG-ALT NASA Insignia
https://www.nasa.gov/External Subdomain National Aeronautics and Space Administration
https://www.nasa.gov/goddardExternal Subdomain Goddard Space Flight Center
https://imagine.gsfc.nasa.gov/Anchor IMG-ALT Menu
A-TITLE Menu
https://imagine.gsfc.nasa.gov/Subdomain IMG-ALT Imagine the Universe!
https://imagine.gsfc.nasa.gov/Home
/science/Science
/science/toolbox/Astronomer's Toolbox
/science/objects/Cosmic Objects
/science/questions/Big Questions
/science/featured_science/Featured Science
/observatories/Observatories
/observatories/learning/Learning Centers
/observatories/satellite/Satellite Showcase
/observatories/data/How Scientists Get Data
/observatories/technology/Detection Technology
/observatories/history/History of High Energy Observatories
/features/Special Exhibits
/features/coloring_pages/Coloring Pages
/features/bios/Scientist Profiles
/features/yba/You Be the Astrophysicist
/features/cosmic/Cosmic Distance Scale
/educators/Educators
/educators/lesson_plans.htmlLesson Plans
/educators/materials.htmlMaterials
/educators/programs/Programs
/ask_astro/Ask An Astrophysicist
/resources/Resources
/resources/Other Resources
/resources/dictionary.htmlDictionary
/cgi-bin/search/search.plSearch
http://starchild.gsfc.nasa.gov...External Subdomain StarChild
/features/coloring_pages/We've Expanded Our Coloring Pages
/features/coloring_pages/black...ones showing scenes from NASA's Black Hole Safety video
/features/coloring_pages/fermi/coloring pages based on stained glass-inspired depictions of Fermi and its science
/features/coloring_pages/nearl...a set with scenes from the NASA's Tips for Near-light-speed Travel video
/educators/programs/au/Afterschool Universe is Now Hosted on Imagine the Universe
/educators/programs/cosmictimes/Cosmic Times is Now Hosted on Imagine the Universe
/educators/programs/spaceforen...Stars exploding? Who would do such a thing?
/features/bios/current.htmlFeatured Scientist: Dr. Marc Kuchner
https://imagine.gsfc.nasa.gov/Text duplicate Home
/science/Text duplicate Science
/science/toolbox/Text duplicate Astronomer's Toolbox
/science/objects/Text duplicate Cosmic Objects
/science/questions/Text duplicate Big Questions
/science/featured_science/Text duplicate Featured Science
/observatories/Text duplicate Observatories
/observatories/learning/Text duplicate Learning Centers
/observatories/satellite/Text duplicate Satellite Showcase
/observatories/data/Text duplicate How Scientists Get Data
/observatories/technology/Text duplicate Detection Technology
/observatories/history/Text duplicate History of High Energy Observatories
/features/Text duplicate Special Exhibits
/features/coloring_pages/Text duplicate Coloring Pages
/features/bios/Text duplicate Scientist Profiles
/features/yba/Text duplicate You Be the Astrophysicist
/features/cosmic/Text duplicate Cosmic Distance Scale
/educators/Text duplicate Educators
/educators/lesson_plans.htmlText duplicate Lesson Plans
/educators/materials.htmlText duplicate Materials
/educators/programs/Text duplicate Programs
/ask_astro/Text duplicate Ask An Astrophysicist
/resources/Text duplicate Resources
/resources/Text duplicate Other Resources
/resources/dictionary.htmlText duplicate Dictionary
/cgi-bin/search/search.plText duplicate Search
https://heasarc.gsfc.nasa.gov/External Subdomain HEASARC
https://science.gsfc.nasa.gov/...External Subdomain Astrophysics Science Division (ASD)
https://www.nasa.gov/External Subdomain NASA
https://www.nasa.gov/goddard/External Subdomain GSFC
https://www.nasa.gov/External Subdomain Text duplicate IMG-ALT NASA Insignia
https://www.nasa.gov/goddardExternal Subdomain IMG-ALT Goddard Signature
/people/lcteam.htmlThe Imagine Team
/people/mattson.htmlDr. Barbara Mattson
/cgi-bin/ideas_html.plJ.D. Myers
https://www.nasa.gov/about/hig...External Subdomain Privacy Policy & Important Notices
https://www.nasa.gov/about/con...External Subdomain Contact NASA
/cgi-bin/ideas_html.plContact Us

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://imagine.gsfc.nasa.gov/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
The web server version is sent within the HTTP header.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time of 0.90 seconds is longer than the recommended limit of 0.4 seconds. A high response time unnecessarily slows down search engine crawling and results in bad user experience as well.
This page only loads 1 CSS files. That's ok.
This page only loads 1 JavaScript files. That's good!
The file size of the HTML document is fine (12 kB).

HTTP Response Header

NameValue
accept-rangesbytes
content-security-policyframe-ancestors 'self' cms.nasa.gov www.nasa.gov beta.science.nasa.gov smd-cms.nasa.gov spaceplace.nasa.gov science.nasa.gov;
content-typetext/html; charset=ISO-8859-1
dateMon, 12 Jan 2026 14:36:40 GMT
serverWebServer/1.0
x-frame-optionssameorigin
strict-transport-securitymax-age=31536000; includeSubDomains
statuscode200
http_versionHTTP/1.0

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 229 referring domains.
This page has 4,096 backlinks.
This page has backlinks from 90 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-Agent: *
Disallow: /docs/science/CometISON_tmp/
Disallow: /evaluation/
Disallow: /cgi-bin/search/

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imagine.gsfc.nasa.gov
Imagine the Universe!
This site is intended for students age 14 and up, and for anyone interested in learning about our universe.

Most important keywords

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

KeywordResultRecheck
Imagine74%Check
Universe72%Check
Afterschool Universe60%Check
Space59%Check
National55%Check
Aeronautics55%Check
Administration55%Check
NASA54%Check
age52%Check
Learning51%Check
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