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SGSiteGraph

spacetelescope.org

ESA/Hubble

Last scanned Jul 26, 2026, 11:19 AM

76

Overall score

Fair

Summary

This website uses Google Analytics behind Cloudflare CDN. SEO is fair (55/100) and accessibility is excellent (90/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: Missing meta description.

Top issues to fix

10 issues found · 4 high priority

  • Missing Strict-Transport-Security header

    Security

    Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.

  • Missing Content-Security-Policy header

    Security

    Add a CSP to control which sources can run scripts — the strongest single defense against XSS.

  • Missing meta description

    SEO

    Add a ~150-character meta description to control your search-result snippet and lift click-through rate.

  • No H1 heading found

    SEO

    Add exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.

  • Missing X-Content-Type-Options header

    Security

    Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.

  • Missing X-Frame-Options header

    Security

    Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.

+4 more issues — details in the sections below.

55

SEO

6 issue(s) found

100

Performance

320 ms

65

Security

HTTPS & header checks

90

Accessibility

1 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

FacebookFacebookX (Twitter)YouTubeInstagramLinkedIn

Contact

Email, phone, and address published on this site's own pages.

Meta tags

Title
ESA/Hubble
Description
Canonical
Language
en
Charset
utf-8
Viewport
width=device-width, initial-scale=1
Robots meta
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
ESA/Hubble Space Telescope
og:description
The ESA page for the Hubble Space Telescope, the space-based observatory that has revolutionised modern astronomy.
og:type
—
og:url
—

Twitter Card

twitter:card
summary
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

Google AnalyticsCloudflare AnalyticsMeta Pixel

Hosting & CDN

Hosting provider
—
CDN provider
Cloudflare
IP address
104.21.66.140
ASN
—

DNS records

TypeValue
A
  • 104.21.66.140
  • 172.67.204.133
AAAA
  • 2606:4700:3032::6815:428c
  • 2606:4700:3033::ac43:cc85
MX
  • alt4.aspmx.l.google.com
  • alt2.aspmx.l.google.com
  • aspmx.l.google.com
  • alt1.aspmx.l.google.com
  • alt3.aspmx.l.google.com
TXT
  • google-site-verification=FbUJ7woCbUCGCRdk_rLEpxnTLqmiFYn4fhEHzlppUuI
  • v=spf1 include:dc-aa8e722993._spfm.esahubble.org include:mailgun.org include:_spf.google.com ~all
NS
  • jack.ns.cloudflare.com
  • fay.ns.cloudflare.com
CAA—
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Google Trust Services
Subject
esahubble.org
Valid from
Jul 19, 2026
Valid to
Oct 17, 2026
Days until expiry
80
SAN domains
esahubble.org, *.esahubble.org

Security headers

  • Strict-Transport-SecurityMissing
  • Content-Security-PolicyMissing
  • X-Frame-OptionsMissing
  • X-Content-Type-OptionsMissing
  • Referrer-PolicyMissing
  • Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 0 · H2 0 · H3 0

Links

306 internal · 14 external · 0 broken

Images

56 total · 0 missing alt

Scripts / Styles

8 scripts · 3 stylesheets

JS / CSS size

716 KB · 217 KB

Page size

82.6 KB

Robots.txt & Sitemap

robots.txt
Not found
Disallow rules
0
sitemap.xml
Not found
URLs in sitemap
0

SEO issues

  • Missing meta description
  • Missing canonical link
  • No H1 heading found
  • No structured data (JSON-LD) found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found

Scan details

Requested URL
https://spacetelescope.org
Final URL
https://esahubble.org/
HTTP status
200
HTTP version
HTTP/2
Response time
319 ms
HTML size
82.6 KB
Redirect chain
https://spacetelescope.org → https://esahubble.org/

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does spacetelescope.org use?
spacetelescope.org is built with Google Analytics, Cloudflare Analytics, Meta Pixel.
Is spacetelescope.org secure (HTTPS)?
Yes. spacetelescope.org uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Oct 17, 2026.
Who hosts spacetelescope.org?
Hosting provider information for spacetelescope.org is not available yet.
What is spacetelescope.org's SEO score?
spacetelescope.org scored 55/100 for SEO in the latest analysis (fair).
What is spacetelescope.org's overall website score?
spacetelescope.org has an overall SiteGraph score of 76/100, combining SEO, performance, security, and accessibility.