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webbtelescope.org

https://webbtelescope.org· First analyzed 27 Apr 2026· Updated 27 Apr 2026
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webbtelescope.org
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Hosting Provider

Automattic, Inc

IP Address

192.0.66.161

Site Location

🇺🇸 United Statesvia ip

Server Location

🇺🇸 San Francisco, United States

ASN

AS2635

Server

Nginx

CDN

CDN

Nameservers

ns-1055.awsdns-03.org.ns-1567.awsdns-03.co.uk.ns-351.awsdns-43.com.ns-716.awsdns-25.net.

Performance

96

Core Web Vitals

Weight

First Contentful Paint
1.1 s10%
Speed Index
1.4 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.4 MB
85 requests

Image Optimization

Lazy LoadWebPResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
WordPressv6.8.5
cms
NASAv1.1.1Custom
by Lone Rock Point
View Theme

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

19 Technologies Detected

Plugins

10
Nasa Hds Core Setup
Gravity Forms
Nasa BlocksSmd BlocksHubble Space TelescopeWp ParselyAccessibility CheckerAccessibility Checker Pro
Gravity Forms Config
Gravity Forms

Libraries

2
jQueryv3.7.1
jQuery UI

Analytics

2
Google Analytics
Google Analytics 4

Frameworks

1
React

UI Components

1
Slick Carousel

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

A+93/100
30
2
0
Meta Tags14/15
Content10/12
Headings8/8
Technical24/25
E-E-A-T7/7
Images5/7
Links4/5
URL5/5
Social5/5
Freshness4/4
Mobile4/4
Indexability3/3
W
webbtelescope.orgwebbtelescope.org

James Webb Space Telescope - NASA Science

Webb is the premier observatory of the next decade, serving thousands of astronomers worldwide. It studies every phase in the history of our Universe.

Title Length41 chars

Recommended: 50-60 chars (~255px / 580px)

Description Length150 chars

Recommended: 120-160 chars

Issues (0)

    2 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: index

    63 URLs

    63 sub-sitemaps

    robots.txt

    6 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    15/100
    Poor
    4 13

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    D57/100
    Bot Access
    20/25
    Machine Read.
    6/25
    Schema Data
    15/25
    Citation
    16/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    nav
    Text ratio:5%
    Words:3,478
    Token eff.:Good
    Sections/1K:4.3
    Depth:1/5

    Structured Data

    7 JSON-LD
    Article×1.2NewsArticle×1.2Person×1.3Organization×1.1WebSite
    sameAs entity links

    Citation Readiness

    Opening Summary898w
    Descriptive Headingsavg 5.7w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (7)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    A
    84/100
    15
    Passed
    2
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    17/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    11/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    6/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    2 recommendations
    • •Accessibility recommendation preview...
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    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    48/100
    C
    183 mg
    CO₂e / view
    1.4 MB
    Page Weight
    60%
    Cleaner Than
    New Visitor
    209 mg
    vs
    Returning (cached)
    104 mg
    Annual (10K/mo)
    21.9 kg
    Emission Segments
    Data Center
    41 mg
    Network
    44 mg
    Device
    98 mg
    Resource Breakdown
    JavaScript
    235.8 KB
    Images
    982.4 KB
    CSS
    53.8 KB
    Fonts
    83.8 KB
    HTML
    48.9 KB
    Other
    73.4 KB
    Green Hosting Not Verified
    Automattic, Inc
    5 recommendations
    • •Carbon footprint recommendation preview...
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    D

    Security Score

    46%Poor
    Interactive

    HTTPS

    No WAF

    29d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-384

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    26.02.2026

    Valid Until

    27.05.2026

    Subject Alternative Names (1)

    science.nasa.gov

    SHA-256 Fingerprint

    14:41:A9:D4:15:19:BE:96:F0:63:68:E2:31:D3:C6:E4:63:C8:CF:1C...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    accept-ranges
    bytes
    cache-control
    🟡 300s(max-age=300, must-revalidate)
    content-encoding
    ⚡ Brotli(br)
    content-type
    text/html; charset=UTF-8
    date
    Mon, 27 Apr 2026 20:59:24 GMT
    host-header
    a9130478a60e5f9135f765b23f26593b
    Good Warning Issue

    Email Infrastructure

    Custom Mail Server

    Score

    50

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    Domain Information

    webbtelescope.org

    Domain Age
    18y 3m

    Created

    28.01.2008

    Expires

    28.01.2027

    Last Updated

    29.12.2025

    Registrar

    Amazon Registrar, Inc.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked
    Data Protection Officer mentioned

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    A
    89/100
    Mobile Friendly8 breakpoints
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width, initial-scale=1
    1 recommendation
    • •Mobile compatibility recommendation preview...
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    Typography & Readability

    inter + Public Sans Web

    WCAG Partial
    69/100
    Readability
    /30
    19/30

    16px · LH 1.65

    Hierarchy
    /20
    20/20

    5x ratio · ✓ H1→H6

    WCAG
    /25
    12/25

    1:1 min contrast

    Performance
    /25
    18/25

    2 fonts · 6 req

    Heading Font

    inter

    Sans80px

    Body Font

    Public Sans Web

    Sans16px

    Contrast Ratio

    1:1

    12 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    80px
    h1
    60px
    h2
    22px
    h3
    16px
    p

    ✅ Excellent readability: 16px body text is ideal for all devices.

    ⚠️ Hard to read: Flesch score 48/100. Simplify sentences for wider reach.

    ⚠️ Partial contrast: 12 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Strong hierarchy: Headlines are 5.0x larger than body text.

    ❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

    Buy on MyFontsFlesch 48

    Color Palette

    5 unique colors
    Light
    #b0aaa8
    Other· 4.8%
    #17161b
    Text· 56.29999999999998%
    #ffffff
    Primary· 0%
    #000002
    Background· 25.1%
    #4f3e2f
    Secondary· 7.9%
    #3b2924
    Secondary· 6%

    Business & Marketing Stack

    2 Tools Detected

    Growing

    Behavior Analytics

    2
    Google Tag ManagerFree
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    2

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    23 Resources

    20
    Scripts
    3
    Styles
    9
    Async
    8
    Defer

    Top Script Sources

    science.nasa.gov(9)googletagmanager.com(5)youtube.com(2)widgets.flickr.com(1)embedr.flickr.com(1)

    Website Identity

    NASA

    NASA

    Organization

    Webb is the premier observatory of the next decade, serving thousands of astronomers worldwide. It studies every phase in the history of our Universe.

    science.nasa.gov/author/ssabia/
    18 years old
    Location detected: 🇺🇸 United Statesvia ip
    Amazon Registrar, Inc.en-US

    Sponsored

    Last analyzed: 27 Apr 2026 at 20:59

    Historical Analysis & Change Tracking