Apod.nasa.gov - SEO Checker

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Overview of the SEO Check
Meta information
90% 
Page quality
46% 
Page structure
100% 
Link structure
92% 
Server
31% 
External factors
100% 
SEO Score
Response time
1.12 s
File size
5.10 kB
Words
252
Media files
1
Number of links
15 internal / 29 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Astronomy Picture of the Day
The length of the page title is perfect. (264 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
A different astronomy and space science related image is featured each day, along with a brief explanation.
The length of the meta description is perfect. (656 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
Server location: United States of America
The language is not specified in the HTML markup.
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)
No favicon is linked in the HTML code.

Meta tags

NameValue
orgcode661
rnoamber.n.straughn
content-ownerJerry.T.Bonnell.1
webmasterStephen.F.Fantasia.1
descriptionA different astronomy and space science related image is featured each day, along with a brief explanation.
viewportwidth=device-width, initial-scale=1
keywordsNGC 7293, Helix Nebula, planetary nebula

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Page quality

Content
(Critically important)
Words from the H1 heading are not used in the page content.
Only 2 paragraph/s was/were found on this page.
There are only 252 words on this page. Good pages should have about 800 words of useful content.
33.3% of the text are stop words.
Keywords used in the page title are also used in the page content. That's good!
No placeholders texts or images were found.
There are no duplicates on the site.
The average number of words per sentence of 19.6 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" is provided.
This page does not require any JavaScript files.
Bold and strong tags
(Somewhat important)
The amount of tags is very high (9). We recommend using a maximum of 6 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
/apod/image/2507/Helix_GC_1080.jpgA nearly circular nebula with a blue core surrounded by small white knots, an orange ring and expansive red strucures. Please see the explanation for more detailed information.

Page structure

H1 heading
(Critically important)
Astronomy Picture of the Day
The H1 heading is perfect.
Headings
(Important)
The heading structure is perfect.

Heading structure

Heading levelContent
H1 Astronomy Picture of the Day
Some internal link anchor texts are too long.
The number of internal links is ok.
Every linktext is unique.
All internal links are not using dynamic parameters.
There are too many external links (29) on this page.

Found links on this page

LinkAttributesAnchor text
/apod/archivepix.htmlDiscover the cosmos!
/apod/image/2507/Helix_GC_2332...IMG-ALT A nearly circular nebula with a blue core surrounded by small white knots, an orange ring and expansive red strucures. Please see the explanation for more de...
https://www.facebook.com/Georg...External Subdomain George Chatzifrantzis
https://en.wikipedia.org/wiki/...External Subdomain Helix Nebula
http://mathworld.wolfram.com/H...External Subdomain helix
https://chandra.harvard.edu/de...External Subdomain complex geometry
/apod/ap230507.htmlouter loops
https://grammarist.com/acronym...External aka
https://en.wikipedia.org/wiki/...External Subdomain planetary nebula
http://www.youtube.com/watch?v...External Subdomain cloud created
/apod/ap231224.htmlwhite dwarf star
https://science.nasa.gov/ems/1...External Subdomain energetic
https://youtu.be/WnWIt0iz00AExternal fluoresce
https://www.facebook.com/photo...External Subdomain featured picture
http://www.astronomyknowhow.co...External Subdomain hydrogen
https://en.wikipedia.org/wiki/...External Subdomain Greece
http://www.youtube.com/watch?v...External Subdomain close-up
/apod/ap080413.htmlinner edge
https://ui.adsabs.harvard.edu/...External Subdomain still being researched
/apod/random_apod.htmlSubdomain Random APOD Generator
/apod/ap250728.html<
/apod/archivepix.htmlArchive
/apod/lib/apsubmit2015.htmlSubmissions
/apod/lib/aptree.htmlIndex
https://antwrp.gsfc.nasa.gov/c...External Subdomain Search
/apod/calendar/allyears.htmlCalendar
https://apod.com/feed.rssExternal RSS
/apod/lib/edlinks.htmlEducation
/apod/lib/about_apod.htmlAbout APOD
https://asterisk.apod.com/disc...External Subdomain Discuss
/apod/ap250730.html>
http://www.phy.mtu.edu/faculty...External Subdomain Robert Nemiroff
http://www.phy.mtu.edu/External Subdomain MTU
https://antwrp.gsfc.nasa.gov/h...External Subdomain Jerry Bonnell
http://www.astro.umd.edu/External Subdomain UMCP
/apod/lib/about_apod.htmlSpecific rights apply
https://www.nasa.gov/about/hig...External Subdomain NASA Web Privacy
https://www.nasa.gov/general/a...External Subdomain Accessibility
https://www.nasa.gov/privacy/External Subdomain Notices
https://astrophysics.gsfc.nasa...External Subdomain ASD
https://www.nasa.gov/External Subdomain NASA
https://www.nasa.gov/centers/g...External Subdomain GSFC
https://science.nasa.gov/learnersExternal Subdomain NASA Science Activation
http://www.mtu.edu/External Subdomain Michigan Tech. U.

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://apod.nasa.gov/apod/astropix.html"
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 is slow (1.12 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 does not require any CSS files.
This page does not require any JavaScript files.
The file size of the HTML document is fine (5 kB).

HTTP Response Header

NameValue
dateTue, 29 Jul 2025 17:44:59 GMT
serverWebServer/1.0
x-frame-optionssameorigin
accept-rangesbytes
content-length5172
connectionclose
content-typetext/html; charset=UTF-8
strict-transport-securitymax-age=31536000; includeSubDomains
content-security-policyupgrade-insecure-requests
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 1,902 referring domains.
This page has 718,029 backlinks.
This page has backlinks from 1,557 different ip addresses.

Links from Wikipedia

You can find more links using Wikipedia search

Robots.txt

User-agent: *
Allow: /

Similar sites

Search preview

apod.nasa.gov › apod › astropix.html
Astronomy Picture of the Day
A different astronomy and space science related image is featured each day, along with a brief explanation.

Most important keywords

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

KeywordResultRecheck
Day73%Check
Astronomy73%Check
Astronomy Picture70%Check
Picture66%Check
image52%Check
explanation52%Check
red52%Check
featured46%Check
different46%Check
brief46%Check
Show more keywords and terms

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