Cfa.harvard.edu - SEO Checker

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Overview of the SEO Check
Meta information
79% 
Page quality
58% 
Page structure
67% 
Link structure
78% 
Server
0% 
External factors
100% 
SEO Score
Response time
1.05 s
File size
78.10 kB
Words
443
Media files
1
Number of links
69 internal / 6 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Home | Center for Astrophysics | Harvard & Smithsonian
The length of the page title is perfect. (502 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The meta description is missing.
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://cfa.harvard.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)
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)
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
GeneratorDrupal 10 (https://www.drupal.org)
MobileOptimizedwidth
HandheldFriendlytrue
viewportwidth=device-width, initial-scale=1.0
application-nameEmpty
msapplication-TileColor#FFFFFF
msapplication-TileImage/themes/cfa/static/favicons/mstile-144x144.png
msapplication-square70x70logo/themes/cfa/static/favicons/mstile-70x70.png
msapplication-square150x150logo/themes/cfa/static/favicons/mstile-150x150.png
msapplication-wide310x150logo/themes/cfa/static/favicons/mstile-310x150.png
msapplication-square310x310logo/themes/cfa/static/favicons/mstile-310x310.png
langen
x-ua-compatibleIE=edge
charsetutf-8

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Page quality

Content
(Critically important)
There are only 443 words on this page. Good pages should have about 800 words of useful content.
31.4% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
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 21.63 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
This page loads 7 JavaScript files. This may affect the load time negatively.
A viewport "width=device-width, initial-scale=1.0" is provided.
At least one Apple touch icon is specified.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 9 tags for this page.
Image SEO
(Somewhat important)
1 images have no alt attribute. The content of alt attributes is used by search engines.
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
...ic/2022-03/Lisa-Kewley.png?itok=ytW3I7VLNo alt attribute provided

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
Some headings occur twice on the page.
The structure of headings is missing one or more levels. Do not skip heading levels.
Some headings do not have any content.

Heading structure

Heading levelContent
H2 Center for Astrophysics
H2 Empty heading
H2 Big Questions
H2 Research Topics
H2 Discover the Center for Astrophysics
H2 The whole universe, delivered to your inbox.
H2 Footer Column Two
H2 Footer Column Three
H2 Footer Column Four
H2 Footer
H2 Main navigation
H2 Utility Menu
H2 Main navigation Duplicate text
H2 Utility Menu Duplicate text
H3 Harvard & Smithsonian
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 6 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://cfa.harvard.edu/Anchor Skip to main content
/big-questionsSee All The Big Questions
/big-questions/does-life-exist...Does life exist outside of the solar system?
/big-questions/how-do-stars-an...How do stars and planets form and evolve?
/big-questions/what-do-black-h...What do black holes look like?
/big-questions/what-universe-madeWhat is the universe made of?
https://cfa.harvard.edu/researchSee all research topics
/big-questions/what-do-black-h...Subdomain Big Question What do black holes look like?
/people/sara-issaounSubdomain Meet the Scientist Sara Issaoun
/current-night-skyCurrent Night Sky
/news/tempo-air-pollution-sens...Subdomain Featured News TEMPO Air Pollution Sensor Treks Toward Satellite Integration
/research/astrophysics-data-sy...Subdomain Research Project Astrophysics Data System (ADS)
/research/youthastronetSubdomain Research Project YouthAstroNet
/people/sheperd-doelemanSubdomain Meet the Scientist Sheperd Doeleman
/news/planets-form-organic-sou...Show Me Something Amazing
/news/magnetic-field-milky-way...Subdomain Featured News The Magnetic Field in Milky Way "Bones"
/opportunities/fellowships-vis...Fellowship Programs
/people/razieh-emami-meibodySubdomain Meet the Scientist Razieh Emami Meibody
/big-questions/what-happened-e...Subdomain Big Question What happened in the early universe?
https://mailchimp.com/legal/pr...External Privacy Policy
https://mailchimp.com/legal/te...External Terms of Use
/big-questionsBig Questions
https://cfa.harvard.edu/researchResearch
https://cfa.harvard.edu/peoplePeople
/facilities-technologyFacilities & Technology
/opportunitiesOpportunities
https://cfa.harvard.edu/aboutAbout
https://cfa.harvard.edu/newsNews
https://cfa.harvard.edu/eventsEvents
https://cfa.harvard.edu/resourcesResources
/support-our-scienceSupport Our Science
/current-night-skyText duplicate Current Night Sky
/opportunities/sao-employment-...Careers
/about/contact-usContact Us
/accessing-cfa-intranetIntranet
https://cfa.harvard.edu/No Text
/privacy-statementPrivacy
https://www.facebook.com/Cente...New window External Subdomain Center for Astrophysics Facebook
https://twitter.com/CenterforA...New window External Center for Astrophysics Twitter
https://www.youtube.com/channe...New window External Subdomain Center for Astrophysics Youtube Channel
https://www.linkedin.com/compa...New window External Subdomain Center for Astrophysics LinkedIn
https://cfa.harvard.edu/The Center for Astrophysics | Harvard & Smithsonian
https://cfa.harvard.edu/Text duplicate The Center for Astrophysics | Harvard & Smithsonian
/support-our-scienceText duplicate Support Our Science
/support-our-scienceText duplicate Support Our Science
https://cfa.harvard.edu/Home
/big-questionsText duplicate Big Questions
https://cfa.harvard.edu/researchText duplicate Research
https://cfa.harvard.edu/peopleText duplicate People
A-TITLE People
/facilities-technologyText duplicate Facilities & Technology
/opportunitiesAcademics & Opportunities
A-TITLE Academics & Opportunities
https://cfa.harvard.edu/aboutText duplicate About
https://cfa.harvard.edu/resourcesText duplicate Resources
/people/directors-officeDirector's Office
/people/wolbach-libraryWolbach Library
A-TITLE The Wolbach Library focuses on both the future and legacy of astronomical research. One of the world’s preeminent astronomical libraries, the Wolbach is also...
https://cfa.harvard.edu/policiesPolicies
https://cfa.harvard.edu/newsText duplicate News
https://cfa.harvard.edu/eventsText duplicate Events
/accessing-cfa-intranetText duplicate Intranet
A-TITLE Intranet
https://cfa.harvard.edu/No Text
https://cfa.harvard.edu/Text duplicate Home
/big-questionsText duplicate Big Questions
https://cfa.harvard.edu/researchText duplicate Research
https://cfa.harvard.edu/peopleText duplicate People
A-TITLE People
/facilities-technologyText duplicate Facilities & Technology
/opportunitiesText duplicate Academics & Opportunities
A-TITLE Academics & Opportunities
https://cfa.harvard.edu/aboutText duplicate About
https://cfa.harvard.edu/resourcesText duplicate Resources
/people/directors-officeText duplicate Director's Office
/people/wolbach-libraryText duplicate Wolbach Library
A-TITLE The Wolbach Library focuses on both the future and legacy of astronomical research. One of the world’s preeminent astronomical libraries, the Wolbach is also...
https://cfa.harvard.edu/policiesText duplicate Policies
https://cfa.harvard.edu/newsText duplicate News
https://cfa.harvard.edu/eventsText duplicate Events
/accessing-cfa-intranetText duplicate Intranet
A-TITLE Intranet
/support-our-scienceText duplicate Support Our Science

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://cfa.harvard.edu/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
The X-powered header is sent within the response header. (unnecessary)
Performance
(Somewhat important)
The page response time is slow (1.05 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 20 CSS files. This may affect the page load time negatively.
This page loads 7 JavaScript files. This may affect the load time negatively.
The file size of the HTML document is fine (78 kB).

HTTP Response Header

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dateMon, 28 Jul 2025 12:00:06 GMT
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External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 87 referring domains.
This page has 580 backlinks.
This page has backlinks from 82 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

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Most important keywords

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

KeywordResultRecheck
Harvard61%Check
Astrophysics54%Check
Center54%Check
Harvard Smithsonian54%Check
Smithsonian49%Check
CfA46%Check
Footer43%Check
Column43%Check
main43%Check
Footer Column43%Check
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