Ligo.caltech.edu - SEO Checker

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Overview of the SEO Check
Meta information
74% 
Page quality
75% 
Page structure
79% 
Link structure
90% 
Server
70% 
External factors
100% 
SEO Score
Response time
1.13 s
File size
18.50 kB
Words
392
Media files
21
Number of links
40 internal / 12 external

Task list of SEO Improvements

Meta specifications

Title
(Critically important)
LIGO Lab | Caltech | MIT
The length of the page title is perfect. (225 pixels out of 580 max pixel length)
There are no duplicate words in the title
Meta description
(Critically important)
The Laser Interferometer Gravitational-Wave Observatory (LIGO) consists of two widely separated installations within the United States — one in Hanford Washington and the other in Livingston, Louisiana — operated in unison as a single observatory. LIGO is operated by the LIGO Laboratory, a consortium of the California Institute of Technology (Caltech) and the Massachusetts Institute of Technology (MIT). Funded by the National Science Foundation, LIGO is an international resource for both physics and astrophysics.
The meta description is too long: 3224 pixels from max. 1000 pixels. Optimize description
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)
The favicon is linked correctly.

Meta tags

NameValue
viewportwidth=device-width,initial-scale=1
msapplication-TileColor#ffffff
msapplication-TileImage/assets/favicon/ms-icon-144x144-9411a2cca9812c2d8a93b2107d6bbb4f.png
theme-color#ffffff
imagehttps://www.ligo.caltech.edu/assets/ligo_default_social_image-fa8a65b147c61b5147e1d43f9e7afc98.jpg
descriptionThe Laser Interferometer Gravitational-Wave Observatory (LIGO) consists of two widely separated installations within the United States — one in Hanford Washington and the other in Livingston, Louisiana — operated in unison as a single observatory. LIGO is operated by the LIGO Laboratory, a consortium of the California Institute of Technology (Caltech) and the Massachusetts Institute of Technology (MIT). Funded by the National Science Foundation, LIGO is an international resource for both physics and astrophysics.
csrf-paramauthenticity_token
csrf-token0wCy04zX0oVnlPhadzzPbUOnY+GoUhgh2BhRIjR3c0E=
og:site_nameLIGO Lab | Caltech
og:imagehttps://www.ligo.caltech.edu/assets/ligo_default_social_image-fa8a65b147c61b5147e1d43f9e7afc98.jpg
og:typewebsite
og:descriptionThe Laser Interferometer Gravitational-Wave Observatory (LIGO) consists of two widely separated installations within the United States — one in Hanford Washington and the other in Livingston, Louisiana — operated in unison as a single observatory. LIGO is operated by the LIGO Laboratory, a consortium of the California Institute of Technology (Caltech) and the Massachusetts Institute of Technology (MIT). Funded by the National Science Foundation, LIGO is an international resource for both physics and astrophysics.
Content-Typetext/html; charset=UTF-8
X-UA-CompatibleIE=edge,chrome=1

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Page quality

Content
(Critically important)
There are only 392 words on this page. Good pages should have about 800 words of useful content.
24.2% of the text are stop words.
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.
The average number of words per sentence of 14.88 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.
This page only loads 2 JavaScript files. That's good!
Bold and strong tags
(Somewhat important)
The amount of tags is very high (9). We recommend using a maximum of 8 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
...als-c600800835440c1e3722874dc29012d2.pngLigo_signals
..._image/tidal_deformation2.jpg?1712256928Tidal_deformation2
..._image/tidal_deformation2.jpg?1712256928Tidal_deformation2
..._image/tidal_deformation2.jpg?1712256928Tidal_deformation2
..._image/tidal_deformation2.jpg?1712256928Tidal_deformation2
...e/Picture1_GeorgiaMansell.jpg?1697147770Picture1_georgiamansell
...e/Picture1_GeorgiaMansell.jpg?1697147770Picture1_georgiamansell
...e/Picture1_GeorgiaMansell.jpg?1697147770Picture1_georgiamansell
...e/Picture1_GeorgiaMansell.jpg?1697147770Picture1_georgiamansell
...ite_design_rendering_copy.jpg?1681676539Ligo_india_site_design_rendering_copy
...ite_design_rendering_copy.jpg?1681676539Ligo_india_site_design_rendering_copy
...ite_design_rendering_copy.jpg?1681676539Ligo_india_site_design_rendering_copy
...ite_design_rendering_copy.jpg?1681676539Ligo_india_site_design_rendering_copy
...ide-ce3596915df0767051e5d7d29c27958a.jpgWhat_slide
.../O4_resumes_cover_collage.png?1712255365O4_resumes_cover_collage
...l/homepage-banner-perm-sm.jpg?1582056090Nobel PrizeNobel Prize
...nsf-b095d1e913dd555437f6682a15d70afb.pngFooter_nsf
...ech-dffffad68d75521d67f82d4d77917573.pngFooter_caltech
...mit-7e6fffaf2cde13a3af99772740d5df1d.pngFooter_mit
...lsc-f75e18cb88af4537a57f048612242fd5.pngFooter_lsc
...rgo-2668a383d8713db7632150294c630ea7.pngFooter_virgo

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
H3 LIGO-Virgo-KAGRA (LVK) Collaboration Detected a Remarkable Gravitational-Wave Signal
H3 LIGO Surpasses the Quantum Limit
H3 India Approves Construction of Its Own LIGO
H3 LIGO-Virgo-KAGRA to Resume O4 After Mid-Run Break
H3 LIGO Congratulates LISA Mission Team
H3 Winner of the 2023 Award for Excellence in Detector Characterization and Calibration Announced
H3 LIGO Documentary Released
H3 LIGO Congratulates Pulsar Timing Array Teams for New Gravitational Wave Discovery
H3 LIGO Ready to Explore Secrets of the Universe
H6 Contact LIGO Caltech
H6 Information: (626) 395-2129
Some internal link anchor texts are too long.
Some anchor texts are used more than once.
The number of internal links is ok.
All internal links are not using dynamic parameters.
There are 12 external links on this page.

Found links on this page

LinkAttributesAnchor text
https://www.ligo.caltech.edu/LIGO Caltech
https://www.ligo.caltech.edu/WAHanford Observatory
https://www.ligo.caltech.edu/LALivingston Observatory
https://www.ligo.caltech.edu/MITLIGO MIT
https://www.ligo.caltech.edu/LIGO Laser Interferometer Gravitational-Wave Observatory Supported by the U.S. National Science Foundation Operated by Caltech and MIT
IMG-ALT Ligo_signals
/page/aboutAbout
/page/learn-moreLearn More
https://www.ligo.caltech.edu/newsNews
/galleryGallery
/page/educational-resourcesEducational Resources
/page/scientistsFor Scientists
/page/study-workStudy & Careers
/news/ligo20240405LIGO-Virgo-KAGRA (LVK) Collaboration Detected a Remarkable Gravitational-Wave Signal News Release • April 5, 2024
IMG-ALT Tidal_deformation2
/news/ligo20231023LIGO Surpasses the Quantum Limit Feature Story • October 23, 2023 New technology in operation at LIGO is tackling quantum mechanical noise, enabling LIGO to ...
IMG-ALT Picture1_georgiamansell
/news/ligo20230417India Approves Construction of Its Own LIGO Feature Story • April 17, 2023 LIGO-India will greatly improve the localization of sources of gravitational waves
IMG-ALT Ligo_india_site_design_rendering_copy
/page/what-are-gwWhat are gravitational waves?
/page/why-detect-gwWhy are we looking for them?
/page/science-impactLIGO's Impact
https://chirp.sr.bham.ac.uk/la...External Subdomain Public Alerts
/news/ligo20240403Learn More LIGO-Virgo-KAGRA to Resume O4 After Mid-Run Break News Release • April 3, 2024 After a mid-run break, LIGO and VIRGO detectors will resume search ...
IMG-ALT O4_resumes_cover_collage
/news/ligo20240125LIGO Congratulates LISA Mission Team News Release • January 25, 2024
/news/ligo20231121Winner of the 2023 Award for Excellence in Detector Characterization and Calibration Announced News Release • November 21, 2023
/news/ligo20231004LIGO Documentary Released News Release • October 4, 2023
/news/ligo20230628LIGO Congratulates Pulsar Timing Array Teams for New Gravitational Wave Discovery News Release • June 28, 2023
/news/ligo20230524LIGO Ready to Explore Secrets of the Universe News Release • May 24, 2023
/news/ligo20200623GW190814; Mystery Object in the Mass Gap
/news/ligo20210629GW200105 and GW200115: NSBH binaries
/page/press-release-gw170817GW170817: First BNS GW observation with EM counterparts
/page/press-release-gw170817Nobel Prize
/detectionGW150914 detection portal
https://www.ligo.org/External Subdomain LIGO Scientific Collaboration
https://dcc.ligo.org/LIGO-M220...New window External Subdomain Citing the LIGO–Virgo–KAGRA Collaboration
https://www.gw-openscience.org/External Subdomain LIGO Open Science Center
https://www.gw-openscience.org...External Subdomain Observatory Status
http://caltech.sharepoint.com/...New window External Subdomain LIGO Laboratory internal bulletin board
/page/what-are-gwText duplicate What are gravitational waves?
/page/why-detect-gwText duplicate Why are we looking for them?
/page/science-impactLIGO's impact
/page/GWPhoneAlertsSubdomain Public alerts of candidate events
/page/observing-plansCurrent and future observing plans
/page/press-release-2017-nobel...Text duplicate IMG-ALT Nobel Prize
A-TITLE Nobel Prize
/page/contactContact LIGO Caltech
/page/employmentCareers
/page/anti-harassment-statementAnti-Harassment Policy
/page/image-use-policyImage Use Policy
/page/privacy-policyPrivacy Policy
http://www.nsf.gov/External Subdomain IMG-ALT Footer_nsf
A-TITLE The U.S. National Science Foundation
http://www.caltech.edu/External Subdomain IMG-ALT Footer_caltech
A-TITLE California Institute of Technology
http://www.mit.edu/External Subdomain IMG-ALT Footer_mit
A-TITLE Massachusetts Institute of Technology
http://www.ligo.org/External Subdomain IMG-ALT Footer_lsc
A-TITLE LIGO Scientific Collaboration
http://www.virgo-gw.eu/External Subdomain IMG-ALT Footer_virgo
A-TITLE VIRGO Homepage
http://ice.ipac.caltech.edu/External Subdomain Website designed by IPAC Communications & Education Team

Server configuration

HTTP redirects
(Critically important)
This page redirects to "https://www.ligo.caltech.edu/"
HTTP header
(Important)
The web server version is sent within the HTTP header.
The X-powered header is sent within the response header. (unnecessary)
This page uses GZip for compressed data transmission.
Performance
(Somewhat important)
The page response time is slow (1.13 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 only loads 2 CSS files. That's ok.
This page only loads 2 JavaScript files. That's good!
The file size of the HTML document is fine (19 kB).

HTTP Response Header

NameValue
cache-controlmax-age=0, private, must-revalidate
content-encodinggzip
content-typetext/html; charset=utf-8
dateTue, 24 Sep 2024 00:36:30 GMT
etag"e9bb08938217ff9ce0a694d945eb2895-gzip"
serverApache/2.4.29 (Ubuntu)
set-cookie278 Characters
status200 OK
varyAccept-Encoding
x-powered-byPhusion Passenger 6.0.6
x-rack-cachemiss
x-request-id6564949eb54e5be1ab8699af7ba273bd
x-runtime0.040556
x-ua-compatibleIE=Edge,chrome=1
content-length5645
connectionkeep-alive
statuscode200
http_versionHTTP/1.1

External factors

Blacklists
(Nice to have)
This website is not classified "for adult only".
This website has excellent links from other websites.
This page has backlinks from 5,835 referring domains.
This page has 53,820 backlinks.
This page has backlinks from 3,458 different ip addresses.
Facebook popularity
(Somewhat important)
The page has 0 shares and comments on Facebook.

Links from Wikipedia

No links from Wikipedia were found.

Robots.txt

# See http://www.robotstxt.org/wc/norobots.html for documentation on how to use the robots.txt file
#
# To ban all spiders from the entire site uncomment the next two lines:
# User-Agent: *
# Disallow: /

Similar sites

Search preview

www.ligo.caltech.edu
LIGO Lab | Caltech | MIT
The Laser Interferometer Gravitational-Wave Observatory (LIGO) consists of two widely separated installations within the United States — one in Hanford Washington and the other in Livingston, Louisiana — operated in unison as a single observatory. LIGO is operated by the LIGO Laboratory, a consortium of the California Institute of Technology (Caltech) and the Massachusetts Institute of Technology (MIT). Funded by the National Science Foundation, LIGO is an international resource for both physics and astrophysics.

Most important keywords

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

KeywordResultRecheck
Caltech77%Check
LIGO76%Check
LIGO Caltech74%Check
LIGO Lab66%Check
LIGO VIRGO60%Check
LIGO Laboratory59%Check
LIGO Congratulates58%Check
gravitational54%Check
Wave54%Check
LIGO Scientific54%Check
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