Website review eso.int
ESO
Generated on December 13 2025 11:30 AM
Old data? UPDATE !
The score is 56/100
SEO Content
Title
ESO
Length : 3
Ideally, your title should contain between 10 and 70 characters (spaces included). Use this free tool to calculate text length.
Description
ESO, European Organisation for Astronomical Research in the Southern Hemisphere
Length : 79
Great, your meta description contains between 70 and 160 characters.
Keywords
ESO, eso.org, Astronomy, Astrophysics, Astronomie, Suedsternwarte, telescopes, detectors, comets, planets, stars, galaxies, nebulae, universe, NTT, VLT, VLTI, ALMA, ELT, La Silla, Paranal, Garching, Chile
Good, your page contains meta keywords.
Og Meta Properties
Good, your page take advantage of Og Properties.
| Property | Content |
|---|---|
| title | ESO — The European Southern Observatory |
| description | Welcome to the most powerful astronomical observatories in the world. |
| image | https://cdn.eso.org/images/screen/uhd_yuri_alma_ant_cc.jpg |
| image:secure_url | https://cdn.eso.org/images/screen/uhd_yuri_alma_ant_cc.jpg |
Headings
| H1 | H2 | H3 | H4 | H5 | H6 |
| 5 | 5 | 0 | 0 | 0 | 0 |
- [H1] Our Stories
- [H1] Our Telescopes
- [H1] Visit Us
- [H1] Our use of Cookies
- [H1] ESO Cookies Policy
- [H2] What are cookies?
- [H2] Categories of cookies we use
- [H2] How to manage cookies
- [H2] Updates to the ESO Cookies Policy
- [H2] Additional information
Images
We found 25 images on this web page.
2 alt attributes are empty or missing. Add alternative text so that search engines can better understand the content of your images.
Text/HTML Ratio
Ratio : 15%
Good, this page's ratio of text to HTML code is higher than 15, but lower than 25 percent.
Flash
Perfect, no Flash content has been detected on this page.
Iframe
Great, there are no Iframes detected on this page.
SEO Links
URL Rewrite
Good. Your links looks friendly!
Underscores in the URLs
We have detected underscores in your URLs. You should rather use hyphens to optimize your SEO.
In-page links
We found a total of 307 links including 1 link(s) to files
| Anchor | Type | Juice |
|---|---|---|
| Science | External | Passing Juice |
| User Portal | Internal | Passing Juice |
| Subscribe | Internal | Passing Juice |
| Contact | Internal | Passing Juice |
| Site Map | Internal | Passing Juice |
| Organisation | Internal | Passing Juice |
| Mission-Vision-Values-Strategy | Internal | Passing Juice |
| Director General | Internal | Passing Juice |
| ESO's Governing Bodies | Internal | Passing Juice |
| Austria | Internal | Passing Juice |
| Belgium | Internal | Passing Juice |
| Czechia | Internal | Passing Juice |
| Denmark | Internal | Passing Juice |
| Finland | Internal | Passing Juice |
| France | Internal | Passing Juice |
| Germany | Internal | Passing Juice |
| Ireland | Internal | Passing Juice |
| Italy | Internal | Passing Juice |
| Netherlands | Internal | Passing Juice |
| Poland | Internal | Passing Juice |
| Portugal | Internal | Passing Juice |
| Spain | Internal | Passing Juice |
| Sweden | Internal | Passing Juice |
| Switzerland | Internal | Passing Juice |
| United Kingdom | Internal | Passing Juice |
| Australia (Partner) | Internal | Passing Juice |
| ESO Representation Office in Chile | Internal | Passing Juice |
| Travel to ESO Headquarters | Internal | Passing Juice |
| Travel to Vitacura Office | Internal | Passing Juice |
| Travel to Guesthouse | Internal | Passing Juice |
| Travel to La Silla | Internal | Passing Juice |
| Travel to La Serena | Internal | Passing Juice |
| Travel to Paranal | Internal | Passing Juice |
| Travel to Antofagasta | Internal | Passing Juice |
| Travel to Chajnantor | Internal | Passing Juice |
| Travel to ELT Armazones | Internal | Passing Juice |
| Weekend visits to Paranal | Internal | Passing Juice |
| Weekend Visits to La Silla | Internal | Passing Juice |
| Media Visits | Internal | Passing Juice |
| Virtual Visits | Internal | Passing Juice |
| ESO and Society | Internal | Passing Juice |
| Architecture at ESO | Internal | Passing Juice |
| Timeline | Internal | Passing Juice |
| Environmental sustainability at ESO | Internal | Passing Juice |
| ESO and the UN's Sustainable Development Goals | Internal | Passing Juice |
| Diversity, Equity and Inclusion | Internal | Passing Juice |
| Dark skies preservation | Internal | Passing Juice |
| Terms and Conditions | Internal | Passing Juice |
| Advanced Search | Internal | Passing Juice |
| Image Comparisons | Internal | Passing Juice |
| 2025 | Internal | Passing Juice |
| 2024 | Internal | Passing Juice |
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| 2007 | Internal | Passing Juice |
| Usage of ESO Images and Videos | Internal | Passing Juice |
| Advanced Search | Internal | Passing Juice |
| Video Formats | Internal | Passing Juice |
| 2025 | Internal | Passing Juice |
| 2024 | Internal | Passing Juice |
| 2023 | Internal | Passing Juice |
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| 2025 | Internal | Passing Juice |
| 2024 | Internal | Passing Juice |
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| 2022 | Internal | Passing Juice |
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| 2011 | Internal | Passing Juice |
| 2010 | Internal | Passing Juice |
| 2009 | Internal | Passing Juice |
| ESOblog | External | Passing Juice |
| ESO Newsletters | Internal | Passing Juice |
| Annual Reports | Internal | Passing Juice |
| Apparel | Internal | Passing Juice |
| Books | Internal | Passing Juice |
| Brochures | Internal | Passing Juice |
| Calendars | Internal | Passing Juice |
| CAPjournals | Internal | Passing Juice |
| Conferences | Internal | Passing Juice |
| DVDs/Bluray/CDs | Internal | Passing Juice |
| ESO Supernova Activities | Internal | Passing Juice |
| Flyers | Internal | Passing Juice |
| Handouts | Internal | Passing Juice |
| Maps | Internal | Passing Juice |
| Merchandise | Internal | Passing Juice |
| Mounted Images | Internal | Passing Juice |
| Postcards | Internal | Passing Juice |
| Posters | Internal | Passing Juice |
| Reports | Internal | Passing Juice |
| Stickers | Internal | Passing Juice |
| View shopping cart | Internal | Passing Juice |
| Checkout | Internal | Passing Juice |
| Bulk Orders | Internal | Passing Juice |
| Purchasing Steps | Internal | Passing Juice |
| Payment | Internal | Passing Juice |
| Shipping | Internal | Passing Juice |
| Staff Shopping | Internal | Passing Juice |
| Terms & Conditions | Internal | Passing Juice |
| Free Orders for Educators and Media | Internal | Passing Juice |
| 4LGSF | Internal | Passing Juice |
| CUBES | Internal | Passing Juice |
| CRIRES+ | Internal | Passing Juice |
| ESPRESSO | Internal | Passing Juice |
| ERIS | Internal | Passing Juice |
| FLAMES | Internal | Passing Juice |
| FORS1 and FORS2 | Internal | Passing Juice |
| HAWK-I | Internal | Passing Juice |
| KMOS | Internal | Passing Juice |
| MOONS | Internal | Passing Juice |
| MUSE | Internal | Passing Juice |
| SPHERE | Internal | Passing Juice |
| UVES | Internal | Passing Juice |
| VISIR | Internal | Passing Juice |
| X-shooter | Internal | Passing Juice |
| GRAVITY+ | Internal | Passing Juice |
| GRAVITY | Internal | Passing Juice |
| MATISSE | Internal | Passing Juice |
| NAOMI | Internal | Passing Juice |
| PIONIER | Internal | Passing Juice |
| Auxiliary Telescopes | Internal | Passing Juice |
| The VISTA mirror | Internal | Passing Juice |
| 4MOST | Internal | Passing Juice |
| The VISTA surveys | Internal | Passing Juice |
| The VISTA consortium | Internal | Passing Juice |
| The VST mirrors | Internal | Passing Juice |
| OmegaCAM | Internal | Passing Juice |
| The VST surveys | Internal | Passing Juice |
| SPECULOOS | Internal | Passing Juice |
| NGTS | Internal | Passing Juice |
| Cherenkov Telescope Array Observatory | Internal | Passing Juice |
| Swedish–ESO Submillimetre Telescope | Internal | Passing Juice |
| EFOSC2 | Internal | Passing Juice |
| SOFI | Internal | Passing Juice |
| SOXS | Internal | Passing Juice |
| HARPS | Internal | Passing Juice |
| NIRPS | Internal | Passing Juice |
| FEROS | Internal | Passing Juice |
| GROND | Internal | Passing Juice |
| WFI | Internal | Passing Juice |
| CORALIE | Internal | Passing Juice |
| Rapid Eye Mount telescope | Internal | Passing Juice |
| TRAnsiting Planets and PlanetesImals Small Telescope–South | Internal | Passing Juice |
| DFOSC | Internal | Passing Juice |
| Télescope à Action Rapide pour les Objets Transitoires | Internal | Passing Juice |
| ESO 1-metre Schmidt telescope | Internal | Passing Juice |
| ESO 1.52-metre telescope | Internal | Passing Juice |
| FIDEOS | Internal | Passing Juice |
| ESO 0.5-metre telescope | Internal | Passing Juice |
| Coudé Auxiliary Telescope | Internal | Passing Juice |
| MarLy 1-metre telescope | Internal | Passing Juice |
| Dutch 0.9-metre telescope | Internal | Passing Juice |
| Swiss T70 telescope | Internal | Passing Juice |
| Bochum 0.61-metre telescope | Internal | Passing Juice |
| Danish 0.5-metre telescope | Internal | Passing Juice |
| Grand Prisme Objectif telescope | Internal | Passing Juice |
| Swiss 0.4-metre telescope | Internal | Passing Juice |
| Marseille 0.36-metre telescope | Internal | Passing Juice |
| GRB Monitoring System | Internal | Passing Juice |
| MASCARA | Internal | Passing Juice |
| BlackGEM | Internal | Passing Juice |
| ExTrA | Internal | Passing Juice |
| Test-Bed Telescope | Internal | Passing Juice |
| ArTéMiS | Internal | Passing Juice |
| CHAMP+ | Internal | Passing Juice |
| CONCERTO | Internal | Passing Juice |
| FLASH+ | Internal | Passing Juice |
| PI230 | Internal | Passing Juice |
| SABOCA | Internal | Passing Juice |
| SEPIA | Internal | Passing Juice |
| Antennas | Internal | Passing Juice |
| Transporters | Internal | Passing Juice |
| Interferometry | Internal | Passing Juice |
| Receiver Bands | Internal | Passing Juice |
| ALMA Residencia | Internal | Passing Juice |
| Wideband Sensitivity Upgrade | Internal | Passing Juice |
| ELT | Internal | Passing Juice |
| Active Optics | Internal | Passing Juice |
| Adaptive Optics | Internal | Passing Juice |
| Integral Field Units | Internal | Passing Juice |
| Interferometry | Internal | Passing Juice |
| Spectroscopy | Internal | Passing Juice |
| Polarimetry | Internal | Passing Juice |
| Instruments | Internal | Passing Juice |
| ESO Key Astronomical Discoveries | Internal | Passing Juice |
| Exoplanets | Internal | Passing Juice |
| Gravitational Wave Sources | Internal | Passing Juice |
| First image of a black hole | External | Passing Juice |
| First image of the Milky Way central black hole | External | Passing Juice |
| More about the black hole at the galactic centre | External | Passing Juice |
| Gamma-Ray Bursts | Internal | Passing Juice |
| Science Archive | Internal | Passing Juice |
| ESO Permanent Exhibitions | Internal | Passing Juice |
| Teacher Schools | External | Passing Juice |
| ALMA Kids | External | Passing Juice |
| ESO Science Outreach Network | Internal | Passing Juice |
| Social Media | Internal | Passing Juice |
| Webcams | External | Passing Juice |
| ESO Supernova | External | Passing Juice |
| AI Disclaimer | Internal | Passing Juice |
| 3D models | Internal | Passing Juice |
| Music | Internal | Passing Juice |
| Planetarium shows | Internal | Passing Juice |
| Presentations | Internal | Passing Juice |
| Soundscapes | Internal | Passing Juice |
| Virtual Backgrounds | External | Passing Juice |
| Virtual Tours | Internal | Passing Juice |
| Annual Reports | Internal | Passing Juice |
| Books | Internal | Passing Juice |
| Brochures | Internal | Passing Juice |
| Calendars | Internal | Passing Juice |
| Flyers | Internal | Passing Juice |
| Maps | Internal | Passing Juice |
| Press kits | Internal | Passing Juice |
| Postcards | Internal | Passing Juice |
| Stickers | Internal | Passing Juice |
| Printed posters | Internal | Passing Juice |
| Paper models | Internal | Passing Juice |
| Merchandise | Internal | Passing Juice |
| Apparel | Internal | Passing Juice |
| Mounted images | Internal | Passing Juice |
| Electronic posters | Internal | Passing Juice |
| Exhibition material | Internal | Passing Juice |
| Logos | Internal | Passing Juice |
| Order in ESOshop | Internal | Passing Juice |
| Procurement at ESO | Internal | Passing Juice |
| Industry Events | External | Passing Juice |
| Technology Developed by Industries | Internal | Passing Juice |
| Novel technologies by ESO | Internal | Passing Juice |
| ESO know-how | Internal | Passing Juice |
| Projects | Internal | Passing Juice |
| Contact Information | Internal | Passing Juice |
| Recruitment | External | Passing Juice |
| International Staff Members | Internal | Passing Juice |
| Local Staff Members (Spanish / English) | Internal | Passing Juice |
| Fellows | Internal | Passing Juice |
| Students | Internal | Passing Juice |
| Paid Associates | Internal | Passing Juice |
| Working at ESO | Internal | Passing Juice |
| Other Information | Internal | Passing Juice |
| Accelerated by CDN77 | External | Passing Juice |
| YouTube | External | Passing Juice |
| ESO’s official YouTube channel | External | Passing Juice |
| embedding videos information page | External | Passing Juice |
| Chrome | External | Passing Juice |
| Edge | External | Passing Juice |
| Firefox | External | Passing Juice |
| Safari | External | Passing Juice |
SEO Keywords
Keywords Cloud
large telescope astronomers esos vlt new press travel first eso
Keywords Consistency
| Keyword | Content | Title | Keywords | Description | Headings |
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| telescope | 30 |  |
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Usability
Url
Domain : eso.int
Length : 7
Favicon
Great, your website has a favicon.
Printability
We could not find a Print-Friendly CSS.
Language
Good. Your declared language is en.
Dublin Core
This page does not take advantage of Dublin Core.
Document
Doctype
HTML 5
Encoding
Perfect. Your declared charset is UTF-8.
W3C Validity
Errors : 0
Warnings : 0
Email Privacy
Warning! At least one email address has been found in the plain text. Use free antispam protector to hide email from spammers.
Deprecated HTML
Great! We haven't found deprecated HTML tags in your HTML.
Speed Tips
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Excellent, your website doesn't use nested tables. |
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Too bad, your website is using inline styles. |
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Great, your website has few CSS files. |
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Perfect, your website has few JavaScript files. |
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Too bad, your website does not take advantage of gzip. |
Mobile
Mobile Optimization
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Apple Icon |
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Meta Viewport Tag |
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Flash content |
Optimization
XML Sitemap
Missing
Your website does not have an XML sitemap - this can be problematic.
A sitemap lists URLs that are available for crawling and can include additional information like your site's latest updates, frequency of changes and importance of the URLs. This allows search engines to crawl the site more intelligently.
Robots.txt
https://eso.int/robots.txt
Great, your website has a robots.txt file.
Analytics
Missing
We didn't detect an analytics tool installed on this website.
Web analytics let you measure visitor activity on your website. You should have at least one analytics tool installed, but It can also be good to install a second in order to cross-check the data.
PageSpeed Insights
Device
Categories
Free SEO Testing Tool
Free SEO Testing Tool is a free SEO tool which provides you content analysis of the website.