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nso.edu

Home Page - NSO - National Solar Observatory

Last scanned Aug 1, 2026, 9:00 PM · 10 views

78

Overall score

Fair

Summary

Learn how the NSF's National Solar Observatory (NSO) uses its solar observatories to learn about the Sun and how it influences Earth. This website uses WordPress. SEO is good (80/100) and accessibility is excellent (90/100). Security scores fair (65/100) and performance good (80/100). Top issue: No H1 heading found.

Learn how the NSF's National Solar Observatory (NSO) uses its solar observatories to learn about the Sun and how it influences Earth.

Top issues to fix

8 issues found · 3 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.

  • 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.

  • robots.txt not found

    SEO

    Publish /robots.txt with a Sitemap: directive to guide crawlers.

+2 more issues — details in the sections below.

80

SEO

3 issue(s) found

80

Performance

554 ms

65

Security

HTTPS & header checks

90

Accessibility

1 issue(s) found

Score history

-3 overall since Jul 25, 2026

Overall
78
SEO
80
Security
65
Performance
80
Accessibility
90

Organization

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

Learn how the NSF's National Solar Observatory (NSO) uses its solar observatories to learn about the Sun and how it influences Earth.

FacebookX (Twitter)InstagramYouTubeYouTube

Contact

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

Meta tags

Title
Home Page - NSO - National Solar Observatory
Description
Learn how the NSF's National Solar Observatory (NSO) uses its solar observatories to learn about the Sun and how it influences Earth.
Canonical
https://nso.edu/
Language
en-US
Charset
UTF-8
Viewport
width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=1
Robots meta
index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
NSF's National Solar Observatory: Unlocking the mysteries of the Sun and its effects on Earth
og:description
NSF's National Solar Observatory (NSO) is the national center for advancing knowledge of the Sun as the dominant external influence on Earth.
og:type
website
og:url
https://nso.edu/

Twitter Card

twitter:card
summary_large_image
twitter:title
NSF's National Solar Observatory: Unlocking the mysteries of the Sun and its effects on Earth
twitter:description
NSF's National Solar Observatory (NSO) is the national center for advancing knowledge of the Sun as the dominant external influence on Earth.

Technologies

Detected frameworks, languages, and tools.

WordPressWooCommerceApache

Hosting & CDN

Hosting provider
—
CDN provider
—
IP address
—
ASN
—

DNS records

TypeValue
A—
AAAA—
MX—
TXT—
NS—
CAA—
CNAME—
IPv6 supportNo

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
www.nso.edu
Valid from
Jul 23, 2026
Valid to
Oct 21, 2026
Days until expiry
81
SAN domains
diglib-dev.nso.edu, eo-dev.nso.edu, intranet.nso.edu, nso.edu, nsokp-dev.nso.edu, nsosp-dev.nso.edu, solarnews.nso.edu, www.nso.edu

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 4 · H3 240

Links

296 internal · 15 external · 20 broken

Images

254 total · 3 missing alt

Scripts / Styles

66 scripts · 0 stylesheets

JS / CSS size

54.2 KB · 247 KB

Page size

954 KB

Robots.txt & Sitemap

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

SEO issues

  • No H1 heading found
  • robots.txt not found
  • sitemap.xml not found

Accessibility issues

  • No H1 heading found

Scan details

Requested URL
https://nso.edu
Final URL
https://nso.edu
HTTP status
200
HTTP version
HTTP/2
Response time
535 ms
HTML size
954 KB
Redirect chain
https://nso.edu

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Frequently asked questions

What technology does nso.edu use?
nso.edu is built with WordPress, WooCommerce, Apache.
Is nso.edu secure (HTTPS)?
Yes. nso.edu uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 21, 2026.
Who hosts nso.edu?
Hosting provider information for nso.edu is not available yet.
What is nso.edu's SEO score?
nso.edu scored 80/100 for SEO in the latest analysis (great).
What is nso.edu's overall website score?
nso.edu has an overall SiteGraph score of 78/100, combining SEO, performance, security, and accessibility.
Has nso.edu's score changed over time?
nso.edu's overall score has declined by 3 points (from 81 to 78) since Jul 25, 2026.