Airandspace.si.edu - SEO Checker

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Overview of the SEO Check
Meta information
80% 
Page quality
71% 
Page structure
58% 
Link structure
77% 
Server
100% 
External factors
100% 
SEO Score
Response time
0.04 s
File size
178.00 kB
Words
578
Media files
27
Number of links
71 internal / 14 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Homepage | National Air and Space Museum
The length of the page title is perfect. (401 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The Smithsonian's National Air and Space Museum maintains the world's largest and most significant collection of aviation and space artifacts, encompassing all aspects of human flight. It operates two landmark facilities that, together, welcome more than eight million visitors a year.
The meta description is too long: 1734 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://airandspace.si.edu/
There is a valid canonical link 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)
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
descriptionThe Smithsonian's National Air and Space Museum maintains the world's largest and most significant collection of aviation and space artifacts, encompassing all aspects of human flight. It operates two landmark facilities that, together, welcome more than eight million visitors a year.
GeneratorDrupal 10 (https://www.drupal.org)
MobileOptimizedwidth
HandheldFriendlytrue
viewportwidth=device-width, initial-scale=1.0
bundleHomepage
cttypehomepage
google-site-verificationA6EYCksErPTzKSXCkFZy9LCkBSqUzMHo017sw6REZeQ
nasm-2021Empty
langen
twitter:cardsummary_large_image
twitter:titleHomepage
twitter:descriptionThe Smithsonian's National Air and Space Museum maintains the world's largest and most significant collection of aviation and space artifacts, encompassing all aspects of human flight.
twitter:site@airandspace
twitter:imagehttps://airandspace.si.edu/sites/default/files/2022-08/nasm_planet_large.png
og:descriptionThe Smithsonian's National Air and Space Museum maintains the world's largest and most significant collection of aviation and space artifacts, encompassing all aspects of human flight. It operates two landmark facilities that, together, welcome more than
og:imagehttps://airandspace.si.edu/sites/default/files/2022-08/nasm_planet_large.png
og:image:secure_urlhttps://airandspace.si.edu/sites/default/files/2022-08/nasm_planet_large.png
charsetutf-8

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Page quality

Content
(Critically important)
Some words from the page title are not used within the pages content
Words from the H1 heading are not used in the page content.
This page contains 578 words. That's ok.
27.5% of the text are stop words.
The page contains a listing, which indicates a good text layout.
3 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 22.25 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=1.0" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 12 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
...672-2007h_2.jpg?h=27466d3d&itok=sM-wanP8View of the Steven F. Udvar-Hazy Center tower at sunset
...001-000013h.jpg?h=0c4a277e&itok=BopTDawTApollo 11: Buzz Aldrin on the Moon
...-s-082~orig.jpg?h=ad0aac6e&itok=COh2O3mNspace shuttle launch
.../4067_640_1.jpg?h=7271a156&itok=12iSGpbvWomen in Aviation and Space Family Day
...11590-2010h.jpg?h=2cf60e4d&itok=WSmOs9rwBob Hoover Gives an Air Show Performance
...298962100_9b7223fa54_k.jpg?itok=In0HbBnyDozens of various aircraft of all type hang suspended from the ceiling in a large hangar. More aircraft dot the ground.
...M2022-05013.jpg?h=48623d0a&itok=yOphKrK0A conical brown command module seemingly floats in front of a photograph of the moon's surface and the sun behind it.
...b8df261ac_k.jpg?h=652cf5c2&itok=rllJFaebThe Space Shuttle is visible in the background as masked visitors practice social distancing.
...ryService_0.jpg?h=7dff6035&itok=jZx74Yh1A man in a Star Trek uniform stares at the camera.
...ages/14411h.jpg?h=8ef8c101&itok=CgzGOMuLStewardess Image Check
...805cb11561765d8fe78b13.jpg?itok=xgaZt_QAA watch photographed against a dark surface.
...o-3000x3000.png?h=962fdf83&itok=AeNJuY-TPurple and pink logo of AirSpace
..._View2_LIVE.jpg?h=89878737&itok=Mx4EUHgCA large, clear, rectangle-shape display case is filled with numerous artifacts, including space-theme games, toys, T-shirts, and license plates. In front of the case is a panel printed with captions, including this question: Why go to space? Digital renderings of a woman, child, and man are seen looking at and pointing to the display case.
...014a_LIVE_0.jpg?h=f6c6ea22&itok=yRnHNq7BSally Ride floats in the cramped interior of the space shuttle, during the 1983 mission where she became the first American woman in space.
...ages/14298h.jpg?h=76c31a26&itok=T0rjVzd9National Airport Exterior
...id=NASM-NASM2022-00100A-000001&max_w=500Canard biplane with two pusher propellers, cream colored fabric, and wood frame, set against a black background.
...?id=NASM-NASM2022-05013-000003&max_w=500Conical brown spacecraft tilted on a stand in front of a photograph of the moon's surface and the Earth behind it.
...40668000-NASM2016-02327-000002&max_w=500No alt attribute provided
...ryService?id=NASM-SI-2006-2744&max_w=500View of SR-71 Blackbird in foreground and Space Shuttle Discovery behind it, on exhibit at the Steven F. Udvar-Hazy Center.
...Service?id=NASM-NASM2013-02525&max_w=500Delta-winged spaceplane with white and black thermal protection tiles, marked "Discovery" on forward fuselage.
...SM-A20140331000-NASM2016-02432&max_w=500No alt attribute provided
...023-06347-S.JPG?h=3aca20ec&itok=3fkUrz2pA young visitor uses an eclipse viewer they made from eclipse glasses and a paper plate to safely view an annular eclipse. They squint up in concentration.
...Top Graphic.png?h=707772c7&itok=OXCwtJnTPhoto of the sun with the AirSpace logo on top of it
...10/ETP-Hero.jpg?h=d09dc484&itok=zXG_TiihA photo of of exploring the planets gallery. A large sign reads Tour the Solar System and planets hang from above.
...71b218919_k.jpg?h=ddd81dcb&itok=hNs_WtFxA view of the Wright Flyer in situ, with images and text on the wall behind it.
...2c5a2ce5b_k.jpg?h=a1e1a043&itok=ylmh256iA large metal dome-like structure, as seen from underneath it, hangs from the ceiling. A mirror is used to create the illusion that there are four of these structures hanging.
...covers copy.png?h=aac8fd11&itok=1dUVlh0_Three magazine covers featuring an F-4 Phantom and pilot on a runway.

Page structure

H1 heading
(Critically important)
Take your curiosity to new heights
The H1 heading is perfect.
Headings
(Important)
Some headings occur twice on the page.
There are 43 headings on the page. The amount of headings should be in a more proper relation to the amount of text.
Some headings do not have any content.

Heading structure

Heading levelContent
H1 Take your curiosity to new heights
H2 Search form
H2 National Air and Space Museum
H2 Steven F. Udvar-Hazy Center
H2 LGBTQ+ History Makers
H2 Meet the Flight Attendants Who Fought For Equality
H2 Explore
H2 Empty heading
H2 AirSpace Book Club
H2 Sally Ride
H2 Social Change in the Airline Industry
H2 From the collection
H2 What's On
H2 Empty heading
H2 Become a Member
H2 Error message
H3 Visit
H3 One museum, two locations
H3 What's On Duplicate text
H3 At the museum and online
H3 Explore Duplicate text
H3 Dive deep into air and space
H3 Learn
H3 For teachers and parents
H3 Give
H3 Be the spark
H3 Space Time Technology
H3 Futures in Space
H3 Featured deep dives
H3 1903 Wright Flyer
H3 Apollo 11 Command Module Columbia
H3 Star Trek Starship Enterprise Studio Model
H3 Lockheed SR-71 Blackbird
H3 Space Shuttle Discovery
H3 Jacket, Flight, Sally K. Ride
H3 Soar Together Family Day: The Sun at Maximum Activity
H3 AirSpace On Tap
H3 Kenneth C. Griffin Exploring the Planets Gallery
H3 The Wright Brothers & The Invention of the Aerial Age
H3 Destination Moon
H4 One museum, two locations Duplicate text
H4 Thank you. You have successfully signed up for our newsletter.
H4 Sorry, there was a problem. Please ensure your details are valid and try again.
H4 National Air and Space Museum Duplicate text
H4 Steven F. Udvar-Hazy Center Duplicate text
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.
1 links don't have an anchor text.
The number of internal links is ok.
None of the anchor texts is too long.
There are 14 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://airandspace.si.edu/Anchor Skip to main content
https://airandspace.si.edu/No Text
https://www.si.edu/New window External Subdomain No Text
https://www.etix.com/ticket/e/...External Subdomain Reserve Free Passes
/support/ways-give?form=FUNJXU...Subdomain Donate
https://airandspace.si.edu/visitVisit
https://airandspace.si.edu/visitText duplicate Visit
/visit/museum-dcNational Air and Space Museum in DC
/visit/udvar-hazy-centerUdvar-Hazy Center in VA
/learn/plan-field-tripPlan a Field Trip
/visit/group-visitPlan a Group Visit
/whats-onWhat's On
/whats-onText duplicate What's On
/whats-on/eventsEvents
/whats-on/exhibitionsExhibitions
/whats-on/imax-theaters-and-pl...IMAX and Planetarium
/exploreExplore
/exploreText duplicate Explore
/explore/storiesStories
/explore/topicsTopics
/explore/collectionsCollections
/explore/on-demandOn Demand
/explore/researchersFor Researchers
https://airandspace.si.edu/learnLearn
https://airandspace.si.edu/learnText duplicate Learn
/learn/programsPrograms
/learn/learning-resourcesLearning Resources
/learn/field-tripText duplicate Plan a Field Trip
/learn/professional-developmentProfessional Development
/learn/monthly-themeEducation Monthly Theme
/supportGive
/supportText duplicate Give
/support/ways-give?form=FUNJXU...Subdomain Text duplicate Donate
/support/membershipBecome a Member
/support/wall-honorWall of Honor
/support/ways-giveWays to Give
/support/host-eventHost an Event
/visit/museum-dcNational Air and Space Museum
/visit/museum-dcPlan Your Visit
https://s.si.edu/3zRlGpqExternal Subdomain Reserve Passes
/visit/udvar-hazy-centerSteven F. Udvar-Hazy Center
/visit/udvar-hazy-centerText duplicate Plan Your Visit
/explore/topics/people/lgbtq-p...LGBTQ+ History Makers
/stories/editorial/meet-flight...Meet the Flight Attendants Who Fought For Equality
/explore/storiesMore Stories
/stories/editorial/space-time-...Space Time Technology
/stories/editorial/airspace-bo...AirSpace Book Club
/air-and-space-quarterly/issue...Futures in Space
/explore/storiesText duplicate More Stories
/explore/stories/sally-rideSally Ride
/explore/stories/social-change...Social Change in the Airline Industry
/collection-objects/1903-wrigh...1903 Wright Flyer
/collection-objects/command-mo...Apollo 11 Command Module Columbia
/collection-objects/model-star...Star Trek Starship Enterprise Studio Model
/collection-objects/lockheed-s...Lockheed SR-71 Blackbird
/collection-objects/orbiter-sp...Space Shuttle Discovery
/collection-objects/jacket-fli...Jacket, Flight, Sally K. Ride
/explore/collectionsExplore the Collection
/whats-onSee All Events and Exhibitions
/whats-on/events/soar-together...Soar Together Family Day: The Sun at Maximum Activity
/whats-on/events/airspace-tapAirSpace On Tap
/whats-onText duplicate See All Events and Exhibitions
/exhibitions/griffin-exploring...Kenneth C. Griffin Exploring the Planets Gallery
/exhibitions/wright-brothersThe Wright Brothers & The Invention of the Aerial Age
/exhibitions/destination-moonDestination Moon
/support/membership?form=FUNGB...Subdomain Become a Member Today
https://airandspace.si.edu/New window No Text
https://airandspace.si.edu/aboutAbout
/newsroomNewsroom
/supportSupport
/get-involvedGet Involved
/contactContact
/support/host-eventText duplicate Host an Event
https://www.facebook.com/airan...New window External Subdomain No Text
https://x.com/airandspaceNew window External No Text
https://www.instagram.com/aira...New window External Subdomain No Text
https://www.youtube.com/user/a...New window External Subdomain No Text
https://www.flickr.com/photos/...New window External Subdomain No Text
/connectNew window Subdomain No Text
https://maps.google.com/?cid=1...External Subdomain 6th St. and Independence Ave SW Washington, DC 20560
https://www.etix.com/ticket/e/...External Subdomain Free Timed-Entry Passes Required
https://goo.gl/maps/9MCYQS8Vgg...External 14390 Air and Space Museum Parkway Chantilly, VA 20151
https://www.si.edu/New window External Subdomain No Text
https://www.si.edu/privacy/New window External Subdomain Privacy
https://www.si.edu/termsofuse/New window External Subdomain Terms of Use

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://airandspace.si.edu/"
HTTP header
(Important)
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 excellent with 0.04 seconds.
The file size of the HTML document is fine (178 kB).

HTTP Response Header

NameValue
cache-controlmax-age=3600, public
content-encodinggzip
content-languageen
content-typetext/html; charset=UTF-8
etagW/"1751099704"
expiresSun, 19 Nov 1978 05:00:00 GMT
last-modifiedSat, 28 Jun 2025 08:35:04 GMT
servernginx
strict-transport-securitymax-age=300
x-content-type-optionsnosniff
x-drupal-cacheHIT
x-drupal-dynamic-cacheMISS
x-generatorDrupal 10 (https://www.drupal.org)
x-pantheon-styx-hostnamestyx-fe2-a-7d5b69868b-8hlvn
x-styx-req-id7a1b706b-5402-11f0-89e5-fab79cb5d110
age1569
accept-rangesbytes
via1.1 varnish, 1.1 varnish, 1.1 varnish, 1.1 varnish
x-frame-optionsSAMEORIGIN
dateSat, 28 Jun 2025 13:56:38 GMT
x-served-bycache-chi-klot8100087-CHI, cache-fra-etou8220037-FRA, cache-fra-eddf8230026-FRA, cache-fra-eddf8230026-FRA
x-cacheHIT, HIT, MISS, MISS
x-cache-hits8, 6, 0, 0
x-timerS1751118999.582803,VS0,VE6
varyAccept-Encoding, Cookie, Cookie, Cookie
content-length56995
statuscode200
http_versionHTTP/2

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 2,685 referring domains.
This page has 194,077 backlinks.
This page has backlinks from 2,031 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

#
# robots.txt
#
# This file is to prevent the crawling and indexing of certain parts
# of your site by web crawlers and spiders run by sites like Yahoo!
# and Google. By telling these "robots" where not to go on your site,
# you save bandwidth and server resources.
#
# This file will be ignored unless it is at the root of your host:
# Used:    http://example.com/robots.txt
# Ignored: http://example.com/site/robots.txt
#
# For more information about the robots.txt standard, see:
# http://www.robotstxt.org/robotstxt.html

User-agent: *
# CSS, JS, Images
Allow: /core/*.css$
Allow: /core/*.css?
Allow: /core/*.js$
Allow: /core/*.js?
Allow: /core/*.gif
Allow: /core/*.jpg
Allow: /core/*.jpeg
Allow: /core/*.png
Allow: /core/*.svg
Allow: /profiles/*.css$
Allow: /profiles/*.css?
Allow: /profiles/*.js$
Allow: /profiles/*.js?
Allow: /profiles/*.gif
Allow: /profiles/*.jpg
Allow: /profiles/*.jpeg
Allow: /profiles/*.png
Allow: /profiles/*.svg
# Directories
Disallow: /core/
Disallow: /profiles/
# Files
Disallow: /README.md
Disallow: /composer/Metapackage/README.txt
Disallow: /composer/Plugin/ProjectMessage/README.md
Disallow: /composer/Plugin/Scaffold/README.md
Disallow: /composer/Plugin/VendorHardening/README.txt
Disallow: /composer/Template/README.txt
Disallow: /modules/README.txt
Disallow: /sites/README.txt
Disallow: /themes/README.txt
Disallow: /web.config
# Paths (clean URLs)
Disallow: /admin/
Disallow: /comment/reply/
Disallow: /filter/tips
Disallow: /node/add/
Disallow: /search/
Disallow: /user/register
Disallow: /user/password
Disallow: /user/login
Disallow: /user/logout
Disallow: /media/oembed
Disallow: /*/media/oembed
# Paths (no clean URLs)
Disallow: /index.php/admin/
Disallow: /index.php/comment/reply/
Disallow: /index.php/filter/tips
Disallow: /index.php/node/add/
Disallow: /index.php/search/
Disallow: /index.php/user/password
Disallow: /index.php/user/register
Disallow: /index.php/user/login
Disallow: /index.php/user/logout
Disallow: /index.php/media/oembed
Disallow: /index.php/*/media/oembed

# Additional Paths
User-agent: *
Disallow: /search?*
Disallow: /collections?*
Disallow: /collections/search?*

Similar sites

Search preview

airandspace.si.edu
Homepage | National Air and Space Museum
The Smithsonian's National Air and Space Museum maintains the world's largest and most significant collection of aviation and space artifacts, encompassing all aspects of human flight. It operates two landmark facilities that, together, welcome more than eight million visitors a year.

Most important keywords

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

KeywordResultRecheck
Space81%Check
Air81%Check
Air Space81%Check
National Air74%Check
Space Museum73%Check
space artifacts66%Check
Museum65%Check
two56%Check
Flight54%Check
new54%Check
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