Nssdc.gsfc.nasa.gov - SEO Checker

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Overview of the SEO Check
Meta information
85% 
Page quality
64% 
Page structure
79% 
Link structure
62% 
Server
28% 
External factors
100% 
SEO Score
Response time
0.78 s
File size
11.50 kB
Words
450
Media files
8
Number of links
40 internal / 10 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Welcome to the NSSDCA
The title contains the word Welcome to! More content should be covered in the title.
There are no duplicate words in the title
Meta description
(Critically important)
NASA Space Science Data Coordinated Archive (NSSDCA) Home Page
The length of the meta description is perfect. (444 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-us
Server location: United States of America
The following language is defined by HTML: en-us
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 XHTML 1.0 Transitional is set correctly.
The doctype is placed at first in the HTML code.
Favicon
(Nice to have)
No favicon is linked in the HTML code.

Meta tags

NameValue
descriptionNASA Space Science Data Coordinated Archive (NSSDCA) Home Page
keywordsNASA, NSSDC, NSSDCA, data, space physics, astronomy, astrophysics, planetary science, planet, planets, moon, lunar science, solar wind, CD-ROM, CD-ROMs, solar physics
orgcode690.1
rnoDavid.R.Williams.1
content-ownerDavid.R.Williams.1
webmasterEdwin.V.Bell.1
langen-us
Content-Typetext/html; charset=UTF-8

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Page quality

Content
(Critically important)
There are only 450 words on this page. Good pages should have about 800 words of useful content.
24.9% 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.
8 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 15.76 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No viewpoint tag is provided.
No Apple touch icon is specified.
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 9 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
/logo/nasa_bigheader_logo.gifNational Aeronautics and Space Administration
/logo/nssdca_header.jpgNASA Space Science Data Coordinated Archive
/button/galaxy_small.jpgAstrophysics
/button/aurora_small.jpgHeliophysics
/button/planet_montage_small.jpgLunar and Planetary Science
/button/astronaut_small.jpgImage Resources
/logo/usagov_logo.gif[USA.gov]
/logo/nasa_logo_small.gifNASA - nasa.gov

Page structure

H1 heading
(Critically important)
There is no H1 heading specified.
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H2 Discipline Services
H2 Archive Support
H2 Access Services
H2 Other Services
H2 NSSDCA
H3 Search:
H3 Recent News in...
H4 Astrophysics
H4 Heliophysics
H4 Lunar and Planetary Science
Baselink: https://nssdc.gsfc.nasa.gov
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.
The number of internal links is ok.
None of the anchor texts is too long.
There are 10 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://nssdc.gsfc.nasa.gov/Anchor Skip to Main Content
http://www.nasa.gov/New window External Subdomain IMG-ALT National Aeronautics and Space Administration
https://www.nasa.gov/New window External Subdomain Visit the NASA Portal
https://www.nasa.gov/goddard/New window External Subdomain Goddard Home
/about/charter.htmlNSSDCA Mission
A-TITLE NSSDCA Mission
/about/about_nssdc.htmlAbout NSSDCA
A-TITLE About the NSSDCA
/nssdc/nssdc_faq.htmlFrequently Asked Questions
A-TITLE Frequently Asked Questions
/search.htmlSearch
/astro/IMG-ALT Astrophysics
/astro/Visit this website
/space/IMG-ALT Heliophysics
/space/Text duplicate Visit this website
/planetary/IMG-ALT Lunar and Planetary Science
/planetaryText duplicate Visit this website
/image/IMG-ALT Image Resources
/image/Text duplicate Visit this website
/nssdc/submitting_data.htmlSubmitting Data
/nssdc/pdmp_guidelines_march93...Guidelines for PDMPs
/nssdc/data_retention.htmlWhite paper on NASA science data retention
/nssdc/RAXWhite_Paperu.pdfWhite paper on Resident archives
/nssdc/PDS_Data_Policies_11033...PDS Data Policies
/nssdc/Heliophysics_Data_Polic...NASA Heliophysics Science Data Management Policy
/archive/pdmp/NASA Mission Project Data Management Plans (PDMPs)
/archive/mou/Memoranda of Understanding
/archive/plan/Archive Plans
/nssdc/obtaining_data.htmlObtaining Data
https://nssdc.gsfc.nasa.gov/nmc/Master Catalog
/publication/Publications
https://nssdc.gsfc.nasa.gov/+ Home
https://nssdc.gsfc.nasa.gov/Services
/astro/Universe Exploration
/space/Text duplicate Heliophysics
/planetary/Solar System Exploration
/image/Text duplicate Image Resources
/nmc/spacecraft/display.action...SPHEREx
/nmc/spacecraft/display.action...XRISM
/nmc/spacecraft/display.action...James Webb Space Telescope
https://www.nasa.gov/feature/g...External Subdomain More...
/nmc/spacecraft/query.action?n...PUNCH
/nmc/spacecraft/display.action...Parker Solar Probe
/nmc/spacecraft/display.action...Solar Orbiter
/nmc/spacecraft/display.action...Resilience
https://ispace-inc.com/news-en...External ispace news release
/nmc/spacecraft/display.action...Cosmos 482
/nmc/spacecraft/display.action...Lucy
https://science.nasa.gov/image...External Subdomain the Lucy news release
http://www.usa.gov/New window External Subdomain IMG-ALT [USA.gov]
http://www.nasa.gov/about/high...External Subdomain Privacy Policy and Important Notices
https://get.adobe.com/reader/External Subdomain Download Adobe Reader
http://www.nasa.gov/New window External Subdomain IMG-ALT NASA - nasa.gov

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://nssdc.gsfc.nasa.gov/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
No X-Powered HTTP header is sent.
Performance
(Somewhat important)
The page response time of 0.78 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 3 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
dateTue, 12 Aug 2025 13:38:03 GMT
serverApache
x-frame-optionsSAMEORIGIN
strict-transport-securitymax-age=31536000; includeSubDomains
accept-rangesbytes
transfer-encodingchunked
content-typetext/html; charset=UTF-8
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 2,038 referring domains.
This page has 3,458 backlinks.
This page has backlinks from 271 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

# /robots.txt for nssdc.gsfc.nasa.gov
# See http://info.webcrawler.com/mak/projects/robots/norobots.html

# by default
User-agent: *
Disallow: /cgi-bin/
Disallow: /bu
Disallow: /ccsds
Disallow: /database
Disallow: /in
Disallow: /lo
Disallow: /nasa
Disallow: /nmc/t
Disallow: /nmc/masterCatalog
Disallow: /sswg
Disallow: /st
Disallow: /util
Disallow: /nmc/personDisplay
Disallow: /nmc/publicationDisplay
Disallow: /nmc/SpacecraftQ
Disallow: /nmc/ExperimentQ
Disallow: /nmc/DatasetQ
Disallow: /nmc/PersonQ
Disallow: /nmc/PublicationQ
Disallow: /nmc/MapQ
Disallow: /nmc/EventQ
Disallow: /nmc/NewDataQ
Disallow: /man

User-agent: gsfcbot
Disallow: /nmc/

User-agane: GPTBot
Disallow: /nmc/

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nssdc.gsfc.nasa.gov
Welcome to the NSSDCA
NASA Space Science Data Coordinated Archive (NSSDCA) Home Page

Most important keywords

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

KeywordResultRecheck
NSSDCA63%Check
NASA61%Check
NASA space57%Check
NASA Space Science Data53%Check
Science52%Check
Space52%Check
Archive52%Check
Space Science52%Check
Science Data50%Check
Space Science Data Coordinated50%Check
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