Sdo.gsfc.nasa.gov - SEO Checker

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Overview of the SEO Check
Meta information
74% 
Page quality
48% 
Page structure
68% 
Link structure
97% 
Server
17% 
External factors
100% 
SEO Score
Response time
0.77 s
File size
30.90 kB
Words
444
Media files
29
Number of links
62 internal / 16 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
SDO | Solar Dynamics Observatory
The length of the page title is perfect. (316 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
SDO is designed to help us understand the Sun's influence on Earth and Near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously.
The meta description is too long: 1239 pixels from max. 1000 pixels. Optimize description
Crawlability
(Critically important)
There are no problems in accessing the website.
Canonical URL
(Important)
https://sdo.gsfc.nasa.gov/mission/publications.php
The specified canonical link points to a different page.
Language
(Somewhat important)
Language detected in text: en
Language defined in HTML: en
Language defined in HTTP-Equiv meta tag: en-us
Server location: United States of America
There are different language information within the page markup.
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 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=1.0
verify-v1T8hRHhd64whPAjTyBXS+by5lsRX6JlZbov0Z0GC9Mfs=
doc-classLiving Document
orgcode671
rnoW. Dean Pesnell
content-ownerApexa Patel
authorApexa Patel
webmasterApexa Patel
descriptionSDO is designed to help us understand the Sun's influence on Earth and Near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously.
langen
X-UA-CompatibleIE=edge
Content-Languageen-us
charsetutf-8

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Page quality

Content
(Critically important)
There are only 444 words on this page. Good pages should have about 800 words of useful content.
The average number of words per sentence of 6.58 words is low.
26.1% 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.
4 paragraphs were found on this page.
No placeholders texts or images were found.
There are no duplicates on the site.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
No Apple touch icon is specified.
This page loads 8 JavaScript files. This may affect the load time negatively.
A viewport "width=device-width, initial-scale=1.0" is provided.
Bold and strong tags
(Somewhat important)
Empty bold or strong tags were found on this page.
Image SEO
(Somewhat important)
29 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
/assets/img/site/SDO_Logo_glassy_lg.pngNo alt attribute provided
/assets/img/latest/SDO_2D.jpgNo alt attribute provided
/assets/img/latest/latest_256_1700.jpgNo alt attribute provided
/assets/img/site/feed-icon16x16.pngNo alt attribute provided
/assets/img/site/feed-icon16x16.pngNo alt attribute provided
/assets/img/latest/latest_512_0193.jpgNo alt attribute provided
/assets/img/latest/latest_512_0171.jpgNo alt attribute provided
/assets/img/latest/latest_512_0304.jpgNo alt attribute provided
/assets/img/latest/latest_512_0211.jpgNo alt attribute provided
/assets/img/latest/latest_512_0131.jpgNo alt attribute provided
/assets/img/latest/latest_512_0335.jpgNo alt attribute provided
/assets/img/latest/latest_512_0094.jpgNo alt attribute provided
/assets/img/latest/latest_512_1600.jpgNo alt attribute provided
/assets/img/latest/latest_512_1700.jpgNo alt attribute provided
...ets/img/latest/latest_1024_211193171.jpgNo alt attribute provided
/assets/img/latest/f_304_211_171_512.jpgNo alt attribute provided
/assets/img/latest/f_094_335_193_512.jpgNo alt attribute provided
/assets/img/latest/f_HMImag_171_512.jpgNo alt attribute provided
/assets/img/latest/latest_512_HMIB.jpgNo alt attribute provided
/assets/img/latest/latest_512_HMII.jpgNo alt attribute provided
/assets/img/latest/latest_512_HMID.jpgNo alt attribute provided
...umbnails/Lunar_eclipse171cross_big_t.jpgNo alt attribute provided
/assets/img/latest/SDO_VO3.jpgNo alt attribute provided
/assets/img/site/hmi_logo_sm.pngNo alt attribute provided
/assets/img/site/aia_logo_sm.pngNo alt attribute provided
/assets/img/site/eve_logo_sm.pngNo alt attribute provided
/assets/img/site/blogger-logo_sm.pngNo alt attribute provided
/assets/img/site/twitter-logo_sm.pngNo alt attribute provided
/assets/img/site/nasa.pngNo 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.
There are 28 headings on the page. The amount of headings should be in a more proper relation to the amount of text.

Heading structure

Heading levelContent
H2 SDO | Solar Dynamics Observatory
H3 SDO Mission Blog
H3 @TheSunToday
H3 Instrument Sites
H3 Social Media
H4 JSOC Repairs are Complete, Normal Data Services have Resumed - Sun, 09 Feb
H4 AIA 0193
H4 AIA 0171
H4 AIA 0304
H4 AIA 0211
H4 AIA 0131
H4 AIA 0335
H4 AIA 094
H4 AIA 1600
H4 AIA 1700
H4 AIA 211, 193, 171
H4 AIA 304, 211, 171
H4 AIA 094, 335, 193
H4 AIA 171 & HMIB
H4 HMI Magnetogram
H4 HMI Intensitygram
H4 HMI Dopplergram
H4 Criss-Crossing Lunar Transit
H4 JSOC Repairs are Complete, Normal Data Services have Resumed - Sun, 09 Feb Duplicate text
H4 JSOC Update and Schedule of Events - Thu, 09 Jan
H4 Outage at the Stanford, JSOC is Offline - Wed, 27 Nov
H4 Looking for Comet C/2024 S1 (ATLAS) - Mon, 28 Oct
H4 Network Outage Causes Data Problems - Wed, 16 Oct
There are 1 links with a trivial anchor text.
The number of internal links is ok.
Every linktext is unique.
None of the anchor texts is too long.
All internal links are not using dynamic parameters.
There are 16 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://sdo.gsfc.nasa.gov/Subdomain No Text
https://sdo.gsfc.nasa.gov/Home (current)
/mission/moc.phpWhere is SDO?
/mission/About SDO
/mission/spacecraft.phpSpacecraft Specs
/mission/instruments.phpInstruments
/mission/publications/Publications
/mission/science.phpScience
/mission/spaceweather.phpSDO & Space Weather
/mission/meetings.phpSDO Meetings
/mission/solarmeetings.phpSolar Meetings
/mission/talks.phpSDO Science Talks
/mission/project.phpProject
/mission/launch.phpSDO Launch
/mission/team.phpTeam
/mission/contact.phpContact
https://sdo.gsfc.nasa.gov/data/The Sun Now
/data/aiahmi/AIA/HMI Browse Data
/data/dailymov.phpDaily Movies
/data/dashboard/New window Browse Data Dashboard
http://lasp.colorado.edu/eve/d...New window External Subdomain EVE Data
/data/synoptic/Synoptic Maps
/data/channels.phpHMI & AIA Channels
/data/bestpractice.phpBest Practice
/data/dataaccess.phpWays to Access Data
/data/rules.phpData Rules
http://sdoisgo.blogspot.com/20...New window External Subdomain JSOC Repairs are Complete, Normal Data Services have Resumed - Sun, 09 Feb Congratulations to the Stanford Team for their rapid repair of the JSOC! ...
http://sdoisgo.blogspot.com/New window External Subdomain Mission Blog - All
/resources/press.phpMedia Resources
/resources/feeds.phpSite Feeds
/resources/talks.phpTalks
/resources/reports.phpReports
/resources/links.phpLinks
/resources/acronyms.phpAcronyms
https://sdo.gsfc.nasa.gov/epo/Outreach Home
/epo/families/SDO for Families
/epo/educators/SDO for Educators
/epo/lovejoy.phpComet Lovejoy Event
/epo/venustransit/2012 Venus Transit
/mercurytransit/public/2016/Subdomain 2016 Mercury Transit Event
/mercurytransit/public/2019/Subdomain 2019 Mercury Transit Event
/gallery/mainSDO Gallery
/gallery/potw/latestPick of the Week
/gallery/firstlight/SDO First Light
/gallery/itl/Integration, Testing, & Launch
/gallery/ultrahd/Ultra HD
/gallery/animations/Animations & Features
https://svs.gsfc.nasa.gov/sear...New window External Subdomain Science Visualization Studio
/gallery/print/Printing Tips
/gallery/copyright/Copyright Permissions
/resources/feeds.phpAll RSS Feeds
/feeds/aia_0193.rssAIA 193
/feeds/aia_0171.rssAIA 171
/feeds/hmib.rssHMI Magnetogram
/feeds/dailymov_0171.rssAIA 0171
/feeds/dailymov_0193.rssAIA 0193
/feeds/dailymov_HMIIF.rssHMI Colorized Intensitygram - Flattened
/feeds/PFSS0171.rssPFSS 0171
/feeds/PFSS0193.rssPFSS 0193
https://sdo.gsfc.nasa.gov/Anchor Previous
https://sdo.gsfc.nasa.gov/Anchor Next
https://sdo.gsfc.nasa.gov/data/More images »
/gallery/potw/item/954Trivial anchor text
read more
/gallery/potw/More picks »
/gallery/main/Main Gallery »
/mission/moc.phpWhere is SDO? »
http://sdoisgo.blogspot.com/20...New window External Subdomain Text duplicate JSOC Repairs are Complete, Normal Data Services have Resumed - Sun, 09 Feb Congratulations to the Stanford Team for their rapid repair of the JSOC! ...
http://sdoisgo.blogspot.com/20...New window External Subdomain URL anchor text
JSOC Update and Schedule of Events - Thu, 09 Jan https://sdo.gsfc.nasa.gov. Stanford continues to rebuild the full capability of the JSOC. Several pi...
http://sdoisgo.blogspot.com/20...New window External Subdomain Outage at the Stanford, JSOC is Offline - Wed, 27 Nov The JSOC is currently offline while the damage is assessed and repaired. The SDO data will be store...
http://sdoisgo.blogspot.com/20...New window External Subdomain Looking for Comet C/2024 S1 (ATLAS) - Mon, 28 Oct ...
http://sdoisgo.blogspot.com/20...New window External Subdomain Network Outage Causes Data Problems - Wed, 16 Oct ...
http://www.twitter.com/thesunt...External Subdomain View details »
http://hmi.stanford.edu/New window External Subdomain No Text
http://aia.lmsal.com/New window External Subdomain No Text
http://lasp.colorado.edu/home/...New window External Subdomain No Text
https://sdoisgo.blogspot.com/New window External Subdomain No Text
https://www.twitter.com/NASA_SDONew window External Subdomain No Text
https://www.nasa.gov/accessibi...New window External Subdomain Accessibility

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://sdo.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 0.77 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 loads 8 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 (31 kB).

HTTP Response Header

NameValue
dateFri, 28 Mar 2025 12:36:21 GMT
serverApache
x-frame-optionsSAMEORIGIN
strict-transport-securitymax-age=31536000; includeSubDomains;
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 3,657 referring domains.
This page has 1,433,933 backlinks.
This page has backlinks from 2,783 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

Sitemap: https://sdo.gsfc.nasa.gov/sitemap.xml

User-agent: *
Disallow: /stats

Similar sites

Search preview

sdo.gsfc.nasa.gov
SDO | Solar Dynamics Observatory
SDO is designed to help us understand the Sun's influence on Earth and Near-Earth space by studying the solar atmosphere on small scales of space and time and in many wavelengths simultaneously.

Most important keywords

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

KeywordResultRecheck
SDO79%Check
Solar62%Check
SDO Data61%Check
Solar Dynamics56%Check
Sun54%Check
Solar Dynamics Observatory54%Check
Dynamics50%Check
Observatory50%Check
nasa48%Check
Space46%Check
Show more keywords and terms

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