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https://hubblesite.org

SEO

· 7 checks — Canonical, meta, content depth, internal links, image SEO, and hreflang rolled into one auditable list.
SCORE
95
GRADE
A
FIX
0
REVIEW
0
PASS
6
INFO
1

Cross-tab audit — SEO, performance, crawlability, mobile, structured data

Checks
7
6 PASS
A+
Canonical URL
Properly configured
PASS
Properly configured
Info::
Canonical tag present
Got: https://science.nasa.gov/mission/hubble/
Info::
Canonical is self-referencing
Info::
Canonical matches final URL after redirects
Info::
Canonical target returns 200
Info::
Canonical points to a different domain
Canonical URL Configured
Page URL https://hubblesite.org Canonical https://science.nasa.gov/mission/hubble/ Match Self-referencing (correct) Target 200 ✓
A+
Meta Tags
Title optimized
PASS
Title optimized
Info::
Page title is set
Got: Hubble Space Telescope - NASA Science
Info::
Title length (37 chars) is optimal
Info::
Title and H1 are well-aligned
Title

"Hubble Space Telescope - NASA Science"

37 characters Optimal ✓
Title: Hubble Space Telescope - NASA Science
H1: Hubble Space Telescope
Match: Similar ✓
Robots: Indexable (no restrictions)
A
Content Depth
2431 words, Very Difficult
PASS
2431 words, Very Difficult
Info::
Page has 2431 words — good depth for search engines
Info::
Text-to-HTML ratio is 4%
Very low ratio suggests heavy framework overhead or boilerplate.
Info::
Reading level: Very Difficult (grade 20)
2431 words

Good depth

Reading level

Very Easy
Easy
Fairly Easy
Standard
Fairly Difficult
Difficult
Very Difficult

Grade 20

Text-to-HTML Ratio

4% text 96% HTML

15 KB / 435 KB

Very low ratio suggests heavy framework overhead or boilerplate.

Why this matters

Informational: ratio of visible text bytes to total HTML bytes. Very low ratios suggest excessive markup overhead.

A+
Image SEO
96 images, 92 descriptive filenames
PASS
96 images, 92 descriptive filenames
Info::
4 image(s) have hash/generic filenames
92 descriptive
0 hash-based
4 generic
96 total
FilenameQualityAltIssues
dsc-3710.jpggeneric✓1
31707975127-d2f019f60f-o.jpggeneric✓1
39071727721-d60e0185a0-o.jpggeneric✓1
50638970996-c014b399f5-o.jpggeneric✓1

See Accessibility tab for detailed alt text quality analysis.

A+
Schema Markup Audit
1 schema types detected
PASS

Rich result eligibility

NewsArticle Eligible

Article rich results

Detected schema types

NewsArticle json-ld → Article rich results
4/4 required · 1/2 recommended
Required fields (Google)
  • headline — Required by Google's structured data spec
  • image — Required by Google's structured data spec
  • author — Required by Google's structured data spec
  • datePublished — Required by Google's structured data spec
Recommended fields
  • dateModified — Recommended for stronger rich result eligibility
  • description — Consider adding description to enrich the NewsArticle schema Recommended for stronger rich result eligibility
Google's spec for this type

Missing schema opportunities

  • easy

    FAQPage

    Page has Q&A-style content (questions in headings) that could be marked up as FAQPage

    FAQ rich results take 2-3× more SERP real estate

  • moderate

    VideoObject

    Page embeds video content that could be marked up as VideoObject

    Videos appear in the video carousel and have a thumbnail badge

Adding these recommended fields improves chances of getting Article rich results in search results.

Why this matters

Schema entity has required fields but could add recommended ones for richer SERP layouts (star ratings, prices, etc.).

Source: Google Search Central

Hreflang
0 hreflang tags
INFO
0 hreflang tags

No hreflang tags detected.

Hreflang tags are only needed for multilingual or multi-regional sites.

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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