Roman.gsfc.nasa.gov - SEO Checker

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Overview of the SEO Check
Meta information
98% 
Page quality
77% 
Page structure
50% 
Link structure
68% 
Server
22% 
External factors
100% 
SEO Score
Response time
0.89 s
File size
49.30 kB
Words
1043
Media files
22
Number of links
79 internal / 60 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
Roman Space Telescope/NASA
The length of the page title is perfect. (284 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
Nancy Grace Roman Space Telescope
The length of the meta description is perfect. (240 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
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 character encoding is not specified in the HTTP header.
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
descriptionNancy Grace Roman Space Telescope
keywordsNancy Grace Roman Space Telescope, Roman Space Telescope, Wide Field Infrared Survey Telescope, wfirst, exoplanets, dark energy, astronomy, high energy, high-energy, x-ray, gamma-ray, gamma ray, physics, astrophysics, universe, science, nasa, space, black hole, blackhole, dark matter
orgcode661
rnoJulie.E.McEnery.1
content-ownerClaire.Andreoli.1
webmasterJennifer.M.Brill.1
doc-classLiving Document
langen
fb:adminsNASARoman
og:urlhttps://roman.gsfc.nasa.gov/
og:typewebsite
og:titleNancy Grace Roman Space Telescope
og:descriptionNancy Grace Roman Space Telescope
og:imagehttps://roman.gsfc.nasa.gov/_include/og-img.jpg
og:image:altRoman Space Telescope
og:site_nameRoman Space Telescope
charsetutf-8

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Page quality

Content
(Critically important)
Words from the H1 heading are not used in the page content.
The average number of words per sentence of 28.54 words is high.
This page contains 1043 words. That's ok.
19.4% 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.
9 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.
A viewport "width=device-width, initial-scale=1.0" is provided.
Bold and strong tags
(Somewhat important)
The usage of strong and bold tags is perfect. We recommend the use of up to 21 tags for this page.
Image SEO
(Somewhat important)
Alt text (alternative text) is correctly used on all found images.
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
/_topassets/img/nasa.pngNASA
/images/interactive-thumbnail.jpgRoman Interactive
/game/game-thumbnail1.jpgRoman Interactive
/webdesign/facebook_icon.pngfacebook
/webdesign/twitter_icon.pngtwitter
/webdesign/instagram_icon.pngyoutube
/webdesign/youtube_icon.pngyoutube
/webdesign/blank.gifSlide background
/webdesign/blank.gifSlide background
/webdesign/blank.gifSlide background
/webdesign/blank.gifSlide background
/webdesign/blank.gifSlide background
/webdesign/blank.gifSlide background
/webdesign/blank.gifSlide background
/webdesign/blank.gifSlide background
/images/partner-jpl.jpgRoman at Jet Propulsion LaboratoryRoman website at JPL
/images/partner-ipac.jpgIPAC/CaltechRoman website at IPAC/Caltech
/images/partner-stsci.jpgSpace Telescope Science Institute (STScI)Roman website at STScI
/webdesign/nasa-logo2.pngNASA logo
/webdesign/goddard.pngGoddard Space Flight Center
/images/social/facebook_icon.pngfacebook
/images/social/twitter_icon.pngfacebook

Page structure

H1 heading
(Critically important)
Nancy Grace Roman Space Telescope
Too many H1 headings
Headings
(Important)
The structure of headings is missing one or more levels. Do not skip heading levels.

Heading structure

Heading levelContent
H1 Nancy Grace Roman Space Telescope
H1 Roman Space Telescope
H1 Look Around the Telescope
H1 Key Resources
H1 Additional Resources
H1 Upcoming Science Events
H2 GODDARD SPACE FLIGHT CENTER
H4 Roman Observatory Overview
H4 Wide-Field Instrument
H4 Roman Overview Papers
H4 Coronagraph Instrument Reference Information
H4 Roman Technical Information
H4 Roman Project Websites
H4 Roman Software and Simulation Tools
H4 Roman Fact Sheets
H4 Calibration
H4 Roman General Astrophysics Ideas and White Papers
H4 SIT Resources
H4 Core Community Survey Resources
H4 Science Centers
H4 Visit the Roman Space Telescope Partner Websites
H4 Contact
H4 Stay Connected
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 too many external links (60) on this page.

Found links on this page

LinkAttributesAnchor text
https://roman.gsfc.nasa.gov/Skip To Content
https://www.nasa.gov/External Subdomain IMG-ALT NASA
/index.htmlNancy Grace Roman Space Telescope
A-TITLE Home Page
/index.htmlRoman Space Telescope
A-TITLE Home Page
https://science.nasa.gov/missi...External Subdomain About Roman
/index.htmlRoman Resources
/science/Observing_Programs_an...Observing Programs & Surveys Overview
/science/core_community_survey...- Core Community Surveys: Overview and Definition
/science/Galactic_Bulge_Time_D...- Galactic Bulge Time-Domain Survey
/science/High_Latitude_Time_Do...- High-Latitude Time-Domain Survey
/science/High_Latitude_Wide_Ar...- High-Latitude Wide-Area Survey
https://science.nasa.gov/missi...External Subdomain - General Astrophysics Surveys: Overview
/science/galactic_plane_survey...- Galactic Plane Survey
/science/Roman_science_teams.htmlScience Teams
/science/observatory_technical...- Mission and Observatory Technical Overview
/science/observatory_technical...- Spacecraft Parameters
/science/observatory_technical...- Telescope Parameters
/science/observatory_technical...- Observatory Instrumentation
/science/observatory_technical...- Field, Slew, and available Roll Angle Information
/science/observatory_technical...- Orbit
/science/WFI_technical.html- WFI Technical Overview
/science/WFI_technical.html- Filters
/science/WFI_technical.html- Imaging Sensitivity
/science/WFI_technical.html- Spectroscopy
/science/WFI_technical.html- Focal Plane System
/science/anticipated_performan...- Overview of anticipated performance tables
/science/apttables2021/table-e...- Exposure times and signal-to-noise ratios
/science/apttables2021/table-s...- Imaging signal-to-noise
/science/apttables2021/table-g...- Grism
/science/apttables2021/table-p...- Prism
/science/apttables2021/table-t...- Saturation of a point source
https://github.com/RomanSpaceT...External Coronagraph Instrument Reference Information
https://github.com/RomanSpaceT...External Roman Technical Information GitHub
/events_science.htmlSubdomain - Science Conferences and Events
/science/workshop112021/- Roman Science Investigation Team Workshop 2021
/science/Early-definition_Astr...- Roman Early-Definition Astrophysics Survey Assessment
https://outerspace.stsci.edu/d...External Subdomain Join the Roman Science Collaboration
https://outerspace.stsci.edu/s...External Subdomain Roman Forum: Join the Roman Community
https://asd.gsfc.nasa.gov/roma...External Subdomain Roman Community Forum: Project Updates
https://roman.ipac.caltech.edu...External Subdomain Roman Virtual Lecture Series
/science/rsig.html- RSIG Overview
/science/rsig_meetings.html- Meetings
/library.html- Document Library
/science/Roman_Reference_Infor...- Roman Reference Information
/science/roses.htmlResearch and Support Participation Opportunities
https://science.nasa.gov/missi...External Subdomain Education and Outreach Materials
https://www.flickr.com/photos/...External Subdomain Photo Gallery
https://svs.gsfc.nasa.gov/gall...External Subdomain Videos and Animations
/gallery-technical_data.htmlTechnical Gallery: Scientific Graphs and Data
https://science.nasa.gov/missi...External Subdomain Media Resources
/interactive/IMG-ALT Roman Interactive
/game.htmlText duplicate IMG-ALT Roman Interactive
https://www.facebook.com/NASAR...External Subdomain IMG-ALT facebook
https://twitter.com/NASARomanExternal IMG-ALT twitter
https://www.instagram.com/expl...External Subdomain IMG-ALT youtube
https://www.youtube.com/channe...External Subdomain Text duplicate IMG-ALT youtube
/science/core_community_survey...Find Out More
https://outerspace.stsci.edu/d...External Subdomain Text duplicate Join the Roman Science Collaboration
https://www.nasa.gov/missions/...External Subdomain Go to NASA Feature
https://roman.ipac.caltech.edu...External Subdomain • Roman Virtual Lecture Series
/science/core_community_survey...• Interact with the Core Community Survey Definition Committees
/science/galactic_plane_survey...• Galactic Plane General Astrophysics Survey Definition
https://outerspace.stsci.edu/s...External Subdomain • Roman Forum: Join the Roman Community
https://asd.gsfc.nasa.gov/roma...External Subdomain • Roman Community Forum: Project Updates
https://outerspace.stsci.edu/d...External Subdomain • Join a Roman Working Group
/engaging_with_Roman.htmlText duplicate Find Out More
/science/Roman_teamlist_cpp.htmlMore information about the Coronagraph CPP
/science/core_community_survey...View the Core Community Survey Definition process
https://forms.gle/B8J6URk7dd9q...External Galactic Plane science pitches
https://forms.gle/F9U6wjugftgE...External CCS science pitches
/interactive/View this Interactive Feature
https://science.nasa.gov/missi...External Subdomain This website is intended for the Roman Science Community. For general information about the mission, please click here to visit the official NASA public audi...
/science/observatory_technical...Mission and Observatory Technical Overview
/science/observatory_technical...Text duplicate - Spacecraft Parameters
/science/observatory_technical...Text duplicate - Telescope Parameters
/science/observatory_technical...Text duplicate - Observatory Instrumentation
/science/observatory_technical...Text duplicate - Field, Slew, and available Roll Angle Information
/science/observatory_technical...Text duplicate - Orbit
/science/core_community_survey...Roman Core Community Surveys
/science/Roman_Reference_Infor...Reference Information
/science/Roman_Reference_Infor...Spreadsheets
/science/WFI_technical.htmlWFI and Observatory Performance
/science/anticipated_performan...Anticipated performance Tables for the WFI
https://ui.adsabs.harvard.edu/...External Subdomain 100 Hubbles for the 2020s (Akeson et al. 2019)
https://ui.adsabs.harvard.edu/...External Subdomain 2015 Report by the Science Definition Team (Spergel et al. 2015)
https://roman.ipac.caltech.edu...External Subdomain Anchor Coronagraph Instrument Parameters
https://roman.ipac.caltech.edu...External Subdomain Additional Coronagraph Instrument Parameters, Models and Data
https://roman.ipac.caltech.edu...External Subdomain Roman Space Telescope Coronagraph Instrument Public Simulated Images
/science/docs/FINAL_CGI_fact_s...Coronagraph Fact Sheet (.pdf)
/science/docs/Roman-CGI-Refere...Roman Coronagraph Reference Information (.pdf)
http://github.com/romanSpaceTe...External Text duplicate Roman Technical Information GitHub
https://science.nasa.gov/missi...External Subdomain NASA's Roman public website
https://www.jpl.nasa.gov/missi...External Subdomain Jet Propulsion Laboratory (JPL) NASA
https://www.stsci.edu/romanExternal Subdomain Space Telescope Science Institute (STScI)
https://roman.ipac.caltech.edu/External Subdomain Caltech/IPAC
https://www.stsci.edu/roman/sc...External Subdomain STScI Roman Science Planning Toolbox
https://www.stsci.edu/roman/sc...External Subdomain - FOV Overlay Tool
https://www.stsci.edu/roman/sc...External Subdomain - PSF Simulation
https://www.stsci.edu/roman/sc...External Subdomain - Source Simulation and Exposure Time Calculator (Pandeia)
https://www.stsci.edu/roman/sc...External Subdomain - Complex Scene Simulation (STIPS)
https://roman.ipac.caltech.edu...External Subdomain IPAC Roman Simulation Repository
https://roman.ipac.caltech.edu...External Subdomain Anchor - WFI imaging and prism
https://roman.ipac.caltech.edu...External Subdomain Anchor - Coronagraph
https://roman.ipac.caltech.edu...External Subdomain Anchor - Dark Energy
https://roman.ipac.caltech.edu...External Subdomain Anchor - Exoplanets
/science/docs/roman-science-sh...Mission & Capabilities Overview (.pdf)
/science/docs/roman-overview.pdfSurveying the Sky (.pdf)
/science/docs/roman-capabiliti...Stars by the Billions (.pdf)
/science/docs/roman-capabiliti...Galaxies by the Millions (.pdf)
/science/docs/cosmology-with-r...Cosmology (.pdf)
https://roman.ipac.caltech.edu...External Subdomain Compiled Spacecraft and Instrument parameters
/science/calibration/WFI_Touch...WFI Touchstone Fields Recommendation Report (.pdf) (.pdf)
/science/ccs_white_papers.htmlRoman Core Community Survey White Papers
/science/Astro2020.htmlSelection of Roman-related ASTRO2020 decadal white papers
https://www.stsci.edu/roman/do...External Subdomain List of Roman-related science papers
https://roman.ipac.caltech.edu...External Subdomain Web interface to Chris Hirata’s WFIRST Galaxy Survey Exposure Time Calculator
http://wfirst.sese.asu.edu/etc...External Subdomain Anchor Cosmic Dawn SIT javascript WFI exposure time calculator
/science/workshop112021/Subdomain Formulation Science Team Summary Workshop
/science/docs/SN_Reference_Sur...Supernova Survey memo (.pdf)
/science/rsig/2021/RSIG-SNsurv...Subdomain High latitude time domain survey presentation (.pdf)
/science/docs/refsurvey_notes_...High Latitude Survey memo (.docx)
/science/rsig/2021/RSIG-HLS.pdfSubdomain HLS presentation (.pdf)
/science/docs/Penny_2019_ApJS_...Microlensing simulation paper (Penny et al) (.pdf)
/science/docs/RGES_Transient_G...Galactic Bulge Time Domain Survey presentation (.ppt)
https://asd.gsfc.nasa.gov/roma...External Subdomain URL anchor text
https://asd.gsfc.nasa.gov/romancaa/
/science/roses/SSDCforROSES.pdfScience Support Center (IPAC) pipelines and science processing (.pdf)
/science/roses/GDPSforROSES.pdfSpectroscopy Processing (.pdf)
/science/roses/MSOSForROSES.pdfGalactic Bulge Time Doman Survey and Exoplanet Microlensing Processing (.pdf)
/science/roses/Roman_WFI_Proce...Science Operations Center (STScI) pipelines and science processing (.pdf)
/events_science.htmlSubdomain Go to Science Events for More Details
https://jpl.nasa.gov/missions/...External Subdomain IMG-ALT Roman at Jet Propulsion Laboratory
https://roman.ipac.caltech.edu/External Subdomain IMG-ALT IPAC/Caltech
https://www.stsci.edu/romanExternal Subdomain Text duplicate IMG-ALT Space Telescope Science Institute (STScI)
https://www.nasa.gov/External Subdomain IMG-ALT NASA logo
https://www.nasa.gov/goddardExternal Subdomain IMG-ALT Goddard Space Flight Center
https://www.nasa.gov/about/hig...External Subdomain Privacy Policy
https://www.nasa.gov/accessibi...External Subdomain Accessibility
https://www.facebook.com/NASAR...External Subdomain Text duplicate IMG-ALT facebook
https://twitter.com/NASARomanExternal Text duplicate IMG-ALT facebook

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://roman.gsfc.nasa.gov/"
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 of 0.89 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.
The file size of the HTML document is fine (49 kB).

HTTP Response Header

NameValue
content-typetext/html
serverMicrosoft-IIS/10.0
strict-transport-securitymax-age=31536000
x-ua-compatibleIE=Edge
x-frame-optionsSAMEORIGIN
dateSat, 10 May 2025 17:54:40 GMT
content-length50498
statuscode200
http_versionHTTP/2

External factors

This page is referenced by wikipedia.
This website has excellent links from other websites.
This page has backlinks from 645 referring domains.
This page has 58,419 backlinks.
This page has backlinks from 543 different ip addresses.

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

KeywordResultRecheck
Roman89%Check
Roman Space83%Check
Roman Space Telescope82%Check
Telescope79%Check
Space79%Check
Space Telescope79%Check
Grace Roman Space Telescope76%Check
Nancy Grace Roman Space70%Check
Roman Science65%Check
Nancy62%Check
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