Public.nrao.edu - SEO Checker

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Overview of the SEO Check
Meta information
59% 
Page quality
84% 
Page structure
79% 
Link structure
42% 
Server
31% 
External factors
100% 
SEO Score
Response time
1.31 s
File size
94.20 kB
Words
1165
Media files
38
Number of links
113 internal / 26 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
National Radio Astronomy Observatory – Revealing the Hidden Universe
The page title should be shorter than 580 pixels. It is 649 pixels long. Optimize title
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://public.nrao.edu/
There is a valid canonical link 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 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
facebook-domain-verification6ye9ncvrtovmj1b4efjzf2mltchdqa
viewportwidth=device-width,initial-scale=1
robotsindex, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1
generatorWooCommerce 9.7.1
tec-api-versionv1
tec-api-originhttps://public.nrao.edu
msapplication-TileImagehttps://public.nrao.edu/wp-content/uploads/2017/11/logo-icon.png
article:modified_time2025-03-06T15:51:24+00:00
langen-us
twitter:cardsummary
twitter:urlhttps://public.nrao.edu/
twitter:titleNational Radio Astronomy Observatory
twitter:descriptionEmpty
twitter:imagehttps://public.nrao.edu/wp-content/themes/nrao/img/logo-icon.png
twitter:site@TheNRAO
og:localeen_US
og:typewebsite
og:titleNational Radio Astronomy Observatory - National Radio Astronomy Observatory
og:descriptionWelcome to the home of the National Radio Astronomy Observatory online.
og:urlhttps://public.nrao.edu/
og:site_nameNational Radio Astronomy Observatory
og:imagehttps://public.nrao.edu/wp-content/uploads/2018/02/NRAO-Logo_Round.png
og:image:width529
og:image:height529
og:image:typeimage/png

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Page quality

Content
(Critically important)
Some words from the page title are not used within the pages content
This page contains 1165 words. That's ok.
27% of the text are stop words.
The page contains a listing, which indicates a good text layout.
23 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 20.55 words is good.
Frames
(Critically important)
This page does not use a frameset.
Mobile optimization
(Somewhat important)
A viewport "width=device-width,initial-scale=1" 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 23 tags for this page.
Image SEO
(Somewhat important)
14 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
.../themes/nrao/img/svg/social/facebook.svgNo alt attribute provided
...content/themes/nrao/img/svg/social/x.svgNo alt attribute provided
...themes/nrao/img/svg/social/instagram.svgNo alt attribute provided
...ent/themes/nrao/img/svg/social/vimeo.svgNo alt attribute provided
/wp-content/themes/nrao/img/NSF_Logo.pngNSF Logo Icon
...ntent/themes/nrao/img/NRAO_logo_text.pngNRAO Logo
...mpression-Juan-Carlos-Algaba-585x300.jpgBlack Hole Jets Reveal New Insights into the Most Powerful Phenomena in the Universe
...4/11/ALMA_Milky-Way_r6night1-300x200.jpgAstronomers Discover “Space Tornadoes” Around the Milky Way’s Core
...lecular_gas_full_nsulzenauer-300x180.jpgHidden Cosmic Fuel Tank Found in Infant Galaxy Cluster
...02_ProximaFlare_ArtistImp_V1-300x169.jpgImage showing an active M dwarf star, Proxima Centuari, in red with many star spots, ejecting a large stellar flare in yellow and white. Proxima Centauri b, a small Earth-like planet is seen in the distant right of the image.
.../03/54284511327_51e94f943f_c-300x169.jpgSpace Company Taps Coast-to-Coast Radio Telescopes for Moon Mission
...VLA_18Mdish_Mtex_02Aug2021_b-300x169.jpgNext-Generation Very Large Array Antenna Design to be Used By German Astronomers
...2/toney-remijan-port-sm-edit-300x240.jpgNew Interim Director for the NSF Green Bank Observatory
...X_NightAntennas_v02_20240610-300x169.pngA New Era of Data Compatibility in Astronomy
...-Newton_TidalDisruptionEvent-300x169.jpgNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
...adilla_large-e1679519234113-585x300.jpegAtacama Large Millimeter/submillimeter Array
...alley_BlueMarble_Graphic_web-585x300.jpgVery Long Baseline Array
...17/01/VLAArrayNiteClouds_RGB-585x300.jpgPhoto of ten VLA antennas pointing at a cloudy sky at twilight.
...-interior-Tohajiile-outreach-585x300.pngNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
...ads/2024/12/Danielle-Rowland-300x203.pngNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
...2/North-Liberty-VLBA-antenna-300x204.pngNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
...ploads/2024/02/eclipse_header-300x86.pngNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
...tent/uploads/2024/03/eclipse-300x168.pngNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
...t/uploads/2024/01/superknova-300x129.jpgNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
..._Flowers_Building_OV40119_lr-300x200.jpgNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
...tent/uploads/2024/01/sampson-300x171.jpgNSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
...nt/uploads/2017/03/w28_hi-1-1170x600.jpgShells of Exploded Stars
.../01/basics_history_Tryptic-1-585x300.jpgHistory Basics Tryptic
...hot-2017-01-10-at-5.49.24-PM-585x300.pngNo alt attribute provided
...7/01/Jupiter_VR48_hi_squared-512x300.jpgNo alt attribute provided
.../themes/nrao/img/svg/social/facebook.svgNo alt attribute provided
...content/themes/nrao/img/svg/social/x.svgNo alt attribute provided
...themes/nrao/img/svg/social/instagram.svgNo alt attribute provided
...ent/themes/nrao/img/svg/social/vimeo.svgNo alt attribute provided
/wp-content/themes/nrao/img/logoNRAO.pngNo alt attribute provided
/wp-content/themes/nrao/img/logoNSF.gifNo alt attribute provided
/wp-content/themes/nrao/img/logoAUI.pngNo alt attribute provided
/wp-content/themes/nrao/img/swoosh-pale.pngNo alt attribute provided

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 NEWS + FEATURES
H2 NRAO TELESCOPES
H2 NRAO BLOGS
H2 #RADIOIMAGEOFTHEWEEK
H2 NRAO Making Waves
H2 EXPLORE + LEARN
H3 Shells of Exploded Stars
H3 Contact Us
H4 Atacama Large Millimeter/submillimeter Array
H4 Very Long Baseline Array
H4 Very Large Array
H4 Announcements and Achievements
H4 Connect with NRAO
Some internal link anchor texts are too long.
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.
There are too many external links (26) on this page.

Found links on this page

LinkAttributesAnchor text
https://public.nrao.edu/Anchor Skip to content
https://www.facebook.com/TheNRAONew window External Subdomain No Text
https://twitter.com/TheNRAONew window External No Text
https://www.instagram.com/thenraoNew window External Subdomain No Text
https://vimeo.com/nraoNew window External No Text
https://science.nrao.edu/New window External Subdomain For Scientists arrow_outward
https://public.nrao.edu/IMG-ALT NSF Logo Icon
https://public.nrao.edu/news/News
https://public.nrao.edu/gallery/Gallery
/telescopes/Telescopes
/telescopes/vla/VLA
/telescopes/alma/ALMA
/telescopes/vlba/VLBA
https://greenbankobservatory.o...External GBT
https://public.nrao.edu/ngvla/Subdomain ngVLA
/telescopes/Tech
https://public.nrao.edu/cdl/Subdomain CDL
/spectrum-management/Subdomain Spectrum Management
/next-generation-radar/Subdomain ngRADAR
https://public.nrao.edu/vlass/Subdomain VLASS
https://public.nrao.edu/visit/Subdomain Visit Us
/visit/very-large-array/Visit VLA
https://www.almaobservatory.or...External Subdomain Visit ALMA
https://greenbankobservatory.o...External Visit GBO
/radio-astronomy/Learn
/radio-astronomy/the-science-o...What is Radio Astronomy?
/radio-astronomy/black-holes/Subdomain Black Holes
/radio-astronomy/exoplanets/Subdomain Exoplanets
/radio-astronomy/pulsars/Subdomain Pulsars Astronomy
/eclipse-basics/Subdomain Eclipse Basics
https://public.nrao.edu/blogs/Subdomain Blogs
https://public.nrao.edu/outreach/Subdomain Outreach Programs & Events
https://public.nrao.edu/explore/Subdomain Explore
/explore/vla-explorer/Subdomain The VLA Explorer
https://public.nrao.edu/color/Subdomain Cosmic Coloring Compositor
/explore/milky-way-explorer/Subdomain Milky Way Explorer
/interferometry-explained/Subdomain Interferometry Explained
/explore/alma-explorer/Subdomain ALMA Explorer
/explore/mission-control/Subdomain NRAO Mission Control
https://public.nrao.edu/join/Join & Give
https://public.nrao.edu/news/NEWS + FEATURES
/news/black-hole-jets-reveal-n...Subdomain 24 March 2025 Black Hole Jets Reveal New Insights into the Most Powerful Phenomena in the Universe An international team of astronomers has made significant ...
IMG-ALT Black Hole Jets Reveal New Insights into the Most Powerful Phenomena in the Universe
/news/astronomers-discover-spa...Subdomain 19 March 2025 Astronomers Discover “Space Tornadoes” Around the Milky Way’s Core
IMG-ALT Astronomers Discover “Space Tornadoes” Around the Milky Way’s Core
/news/hidden-cosmic-fuel-tank-...Subdomain 17 March 2025 Hidden Cosmic Fuel Tank Found in Infant Galaxy Cluster
IMG-ALT Hidden Cosmic Fuel Tank Found in Infant Galaxy Cluster
/news/small-star-mighty-flares...Subdomain 17 March 2025 Small Star, Mighty Flares: ALMA Shares New View of Proxima Centauri
IMG-ALT Image showing an active M dwarf star, Proxima Centuari, in red with many star spots, ejecting a large stellar flare in yellow and white. Proxima Centauri b, ...
/news/space-company-taps-coast...Subdomain 6 March 2025 Space Company Taps Coast-to-Coast Radio Telescopes for Moon Mission
IMG-ALT Space Company Taps Coast-to-Coast Radio Telescopes for Moon Mission
/news/next-generation-very-lar...Subdomain 10 February 2025 Next-Generation Very Large Array Antenna Design to be Used By German Astronomers
IMG-ALT Next-Generation Very Large Array Antenna Design to be Used By German Astronomers
/news/new-interim-director-for...Subdomain 10 February 2025 New Interim Director for the NSF Green Bank Observatory
IMG-ALT New Interim Director for the NSF Green Bank Observatory
/news/a-new-era-of-data-compat...Subdomain 6 February 2025 A New Era of Data Compatibility in Astronomy
IMG-ALT A New Era of Data Compatibility in Astronomy
/news/nsf-vla-high-energy-tran...Subdomain 27 January 2025 NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
https://public.nrao.edu/news/Subdomain See All News
/telescopes/NRAO TELESCOPES
/telescopes/alma/Subdomain ALMA Atacama Large Millimeter/submillimeter Array The Atacama Large Millimeter/submillimeter Array in the Atacama Desert, Chile, is the most complex observat...
IMG-ALT Atacama Large Millimeter/submillimeter Array
https://welcu.com/alma/visit-2017External Visit
/telescopes/vlba/Subdomain VLBA Very Long Baseline Array The Very Long Baseline Array (VLBA) is ten radio telescopes stationed across 5,351 miles. It’s the world’s sharpest, dedicated ...
IMG-ALT Very Long Baseline Array
/telescopes/vla/Subdomain VLA Very Large Array The VLA is the most advanced radio telescope array on Earth, a customizable interferometer that spans up to 22 miles across. Visit
IMG-ALT Photo of ten VLA antennas pointing at a cloudy sky at twilight.
/visit/very-large-array/Subdomain Text duplicate Visit
https://public.nrao.edu/blogs/NRAO BLOGS
/blogs/nsf-nrao-brings-the-nig...Subdomain NSF NRAO Brings the Night Sky to You Jason Schreiner | 3 January 2025 The U.S. National Science Foundation National Radio Astronomy Observatory (NSF NRAO) to...
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
/blogs/nsf-nrao-names-native-n...Subdomain NSF NRAO Names Native Nations Engagement Lead Danielle Rowland | 23 December 2024 Danielle Rowland, Senior Broadening Participation Programs Manager, was rec...
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
/blogs/north-liberty-iowa-the-...Subdomain North Liberty, Iowa: The NSF VLBA’s Only Midwestern Radio Telescope Jill Malusky | 5 December 2024 Nestled in the woods near North Liberty, Iowa, this antenn...
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
/blogs/how-to-safely-view-the-...Subdomain How to Safely View the Eclipse Barbara Gruber | 15 March 2024 Are you planning on viewing the solar eclipse on April 8, 2024? Please make sure you are doing ...
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
/blogs/eclipses-and-exoplanets/Subdomain Eclipses and Exoplanets Barbara Gruber | 11 March 2024 Transit Method When a planet passes directly between a star and its observer, it dims the star’s light...
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
/blogs/learning-shines-brightl...Subdomain Learning Shines Brightly at SuperKnova Brian Koberlein | 31 January 2024 SuperKnova is a project to provide learning opportunities in radio technology for st...
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
/blogs/owens-valley-radio-astr...Subdomain Owens Valley: Radio Astronomy in the Land of Sky and Stream Brian Koberlein | 24 January 2024 Three million years ago the fault regions of the Sierra Nevada ...
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
/blogs/hidden-giants/Subdomain Hidden Giants Brian Koberlein | 9 January 2024 University of the West Indies student Brianna Sampson finds than more than a thousand Giant Radio Galaxies cou...
IMG-ALT NSF VLA Contributes Crucial Puzzle Piece to ‘Peculiar’ High Energy Transient
https://public.nrao.edu/blogs/Subdomain See All Blog Posts
/gallery/shells-of-exploded-st...Subdomain IMG-ALT Shells of Exploded Stars
/gallery/shells-of-exploded-st...Subdomain Text duplicate Shells of Exploded Stars
/gallery/gallery-collection/im...Subdomain See Past Images of the Week
/news/the-vla-fall-open-house/Subdomain The Very Large Array to Host Fall Open House on October 12, 2024 The U.S. National Science Foundation National Radio Astronomy Observatory (NSF NRAO) is thri...
/news/nrao-at-ims/Subdomain Engineers Descend upon DC for International Microwave Symposium, NRAO Will Exhibit, Scientist to Receive Pioneer Award NRAO and the Central Development Labor...
/news/nac-alum-awarded-nsf-gra...Subdomain NAC Alum Awarded NSF Graduate Research Fellowship Carlos Ortiz Quintana, an alumnus of the National Astronomy Consortium (NAC) at NRAO, has been awarded a fi...
/news/aui-announces-2024-schol...Subdomain AUI Announces 2024 Scholarship Recipients Eighteen high school students receive award for academic achievement, community involvement and leadership skills B...
/news/?search_text&search_type...See Past Announcements
/special-features/EXPLORE
/radio-astronomy/LEARN
/radio-astronomy/Text duplicate Learn
/radio-astronomy/the-history-o...Subdomain The History of Radio Astronomy Radio astronomy is a relatively young branch of astronomical science. Today, some of the most important discoveries about our…
IMG-ALT History Basics Tryptic
/special-features/Text duplicate Explore
/explore/alma-explorer/Subdomain ALMA Explorer Welcome to the Atacama Desert of northern Chile. Here, the National Radio Astronomy Observatory, along with its international partners, is buil...
/radio-astronomy/Text duplicate Learn
/radio-astronomy/our-solar-sys...Subdomain Our Solar System We aim radio telescopes at the Sun, planets, moons, and planetesimals in our Solar System.
https://www.facebook.com/TheNRAONew window External Subdomain No Text
https://twitter.com/TheNRAONew window External No Text
https://www.instagram.com/thenraoNew window External Subdomain No Text
https://vimeo.com/nraoNew window External No Text
https://public.nrao.edu/contact/New window mail
https://twitter.com/TheNRAOExternal Tweets by TheNRAO
https://www.nsf.gov/External Subdomain No Text
https://www.nsf.gov/External Subdomain U.S. National Science Foundation
http://www.aui.edu/External Subdomain No Text
http://www.aui.edu/External Subdomain AUI
https://public.nrao.edu/news/Text duplicate News
https://public.nrao.edu/gallery/Text duplicate Gallery
/telescopes/Text duplicate Telescopes
/telescopes/vla/Text duplicate VLA
/telescopes/alma/Text duplicate ALMA
/telescopes/vlba/Text duplicate VLBA
https://greenbankobservatory.o...External Text duplicate GBT
https://public.nrao.edu/ngvla/Subdomain Text duplicate ngVLA
/telescopes/Text duplicate Tech
https://public.nrao.edu/cdl/Subdomain Text duplicate CDL
/spectrum-management/Subdomain Text duplicate Spectrum Management
/next-generation-radar/Subdomain Text duplicate ngRADAR
https://public.nrao.edu/vlass/Subdomain Text duplicate VLASS
https://public.nrao.edu/visit/Subdomain Text duplicate Visit Us
/visit/very-large-array/Text duplicate Visit VLA
https://www.almaobservatory.or...External Subdomain Text duplicate Visit ALMA
https://greenbankobservatory.o...External Text duplicate Visit GBO
/radio-astronomy/Text duplicate Learn
/radio-astronomy/the-science-o...Text duplicate What is Radio Astronomy?
/radio-astronomy/black-holes/Subdomain Text duplicate Black Holes
/radio-astronomy/exoplanets/Subdomain Text duplicate Exoplanets
/radio-astronomy/pulsars/Subdomain Text duplicate Pulsars Astronomy
/eclipse-basics/Subdomain Text duplicate Eclipse Basics
https://public.nrao.edu/blogs/Subdomain Text duplicate Blogs
https://public.nrao.edu/outreach/Subdomain Text duplicate Outreach Programs & Events
https://public.nrao.edu/explore/Subdomain Text duplicate Explore
/explore/vla-explorer/Subdomain Text duplicate The VLA Explorer
https://public.nrao.edu/color/Subdomain Text duplicate Cosmic Coloring Compositor
/explore/milky-way-explorer/Subdomain Text duplicate Milky Way Explorer
/interferometry-explained/Subdomain Text duplicate Interferometry Explained
/explore/alma-explorer/Subdomain Text duplicate ALMA Explorer
/explore/mission-control/Subdomain Text duplicate NRAO Mission Control
https://public.nrao.edu/join/Text duplicate Join & Give
https://science.nrao.edu/External Subdomain For Scientists
https://public.nrao.edu/about/Subdomain About NRAO
https://public.nrao.edu/ask/Ask an Astronomer
http://www.nrao.edu/archives/External Subdomain Historical Archives
/media-use/Media Use
/social-media-policy/Social Media Policy
http://library.nrao.edu/index....External Subdomain NRAO Library
https://public.nrao.edu/cdl/Central Development Lab
/tech-transfer/Subdomain Technology Transfer
https://inside.nrao.edu/External Subdomain Employee Services
https://go.nrao.edu/conductExternal Subdomain Visitor Code of Conduct
https://public.nrao.edu/careers/Subdomain Careers
/contact-us/More Information Here

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://public.nrao.edu/"
HTTP header
(Important)
The HTML page should be transferred using GZip compression.
The web server version is sent within the HTTP header.
The X-powered header is sent within the response header. (unnecessary)
Performance
(Somewhat important)
The page response time is slow (1.31 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.
The file size of the HTML document is fine (94 kB).

HTTP Response Header

NameValue
cache-controlmax-age=3, must-revalidate
content-typetext/html; charset=UTF-8
dateFri, 28 Mar 2025 12:49:27 GMT
serverApache/2.4.37 (Red Hat Enterprise Linux) OpenSSL/1.1.1k
varyAccept-Encoding,Cookie
x-powered-byPHP/8.2.25
statuscode200
http_versionHTTP/2

External factors

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This page has backlinks from 929 referring domains.
This page has 11,584 backlinks.
This page has backlinks from 568 different ip addresses.

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