phys.org llms.txt
In short
phys.org serves a 2.4 KB llms.txt with 5 H2 sections and 17 links, graded B on the llmstxt.org structure (5 of 6 checks). It lacks same-site links. The home page does not link it, so an agent that does not guess paths will not find it. No llms-full.txt was found. Read 4 November 2026.
llms.txt 2.4 KB, 37 lines
# Phys.org
> Phys.org is a daily science and technology news portal covering physics, chemistry, biology, earth sciences, astronomy & space, and nanotechnology, published by Science X.
Phys.org sources stories from staff-written features, peer-reviewed journals, licensed news-agency content, and editor-selected press releases from universities and research institutions, plus closely vetted preprint/conference findings. Articles go through fact-checking and at least two editors' independent review before publication. See Editorial Process below for full detail.
## Main Categories
- [Physics](https://phys.org/physics-news/): General physics, condensed matter, quantum, optics
- [Nanotechnology](https://phys.org/nanotech-news/): Nanomaterials, nanophysics, bio & medicine nanotech applications
- [Chemistry](https://phys.org/chemistry-news/): Materials, polymers, analytical chemistry
- [Earth Sciences](https://phys.org/earth-news/): Geology, environment, climate
- [Astronomy & Space](https://phys.org/space-news/): Astrophysics, planetary science, space exploration
- [Biology](https://phys.org/biology-news/): Ecology, plant science, cell biology
- [Other Sciences](https://phys.org/science-news/): Social science, economics, archaeology
## Feeds
- [Sitemap Index](https://phys.org/sitemap/indx/): Full machine-readable article index
- [RSS Feeds](https://phys.org/rss-feed/): Per-category live feeds
## About
- [About Phys.org](https://sciencex.com/help/about-physorg/)
## About Science X
- [About Science X](https://sciencex.com/help/about-us/): Network overview, mission, history, and Live-rank ranking system
- [Editorial Process](https://sciencex.com/help/editorial-process/): How stories are sourced, fact-checked, and selected […] staff features, peer-reviewed journals, licensed news-agency content, and vetted university press releases, double-reviewed by editors before publication
- [Editorial Standards](https://sciencex.com/help/editorial-standards/): Content and conduct standards
- [Editorial Team](https://sciencex.com/help/editorial-team/): Staff and contributing writers
- [Correction Policy](https://sciencex.com/help/corrections/): How corrections are handled and reported
## Network Sites
- [Medical Xpress](https://medicalxpress.com/): Medical research advances and health news
- [Tech Xplore](https://techxplore.com/): Engineering, electronics, and technology advances
First 37 of 37 lines. 1 span shown as […] because the words or characters in them are rejected by this site's own style rules; the live file has them.
Parse graded B, 5 of 6
file: https://phys.org/llms.txt
Phys.org
Phys.org is a daily science and technology news portal covering physics, chemistry, biology, earth sciences, astronomy & space, and nanotechnology, published by Science X.
5 sections, 17 links, no Optional section.
Ora's cached score: not scored (read 5 November 2026).
The parse
phys.org lists 17 links: 9 point at phys.org or a relative path, 8 point elsewhere. The hosts it links most: phys.org (9), sciencex.com (6), medicalxpress.com (1), techxplore.com (1).
| H2 section | Links |
|---|---|
| Main Categories | 7 |
| Feeds | 2 |
| About | 1 |
| About Science X | 5 |
| Network Sites | 2 |
Grade against the llmstxt.org structure
The file passes 5 of 6 checks and fails 1: at least 80 percent of links point at the same site. The grade is the count of passed checks: six is A, five is B, four is C, three is D, fewer is F. It measures structure only. Whether any agent reads the file is a separate question, covered on the llms.txt reference.
| Check | Result | Detail |
|---|---|---|
| Starts with an H1 naming the site or project | Pass | H1: Phys.org |
| Has a blockquote summary under the H1 | Pass | Blockquote summary found. |
| Has at least one H2 section that lists links | Pass | 5 H2 sections, 5 with links. |
| At least 80 percent of links point at the same site | Fail | 9 of 17 links stay on phys.org (53 percent). |
| Under 100 KB | Pass | 2417 bytes as served. |
| Plain markdown, no HTML | Pass | No HTML document markers in the body. |
Ora's cached score
Not scored by Ora. GET ora.ai/api/score/phys.org answered 404 DOMAIN_NOT_SCANNED on 5 November 2026, so Ora holds no cached score for this domain. This site asked for a cached score only and never requested a scan. A scan by the site's owner would add one.
Linking and the companion file
The home page of phys.org does not link the file in its HTML. Ora's lab found (2026-10-19) that 86 percent of llms.txt fetches by agents arrived through a link, so an unlinked file is mostly a file nobody opens. No llms-full.txt was found at the same root.
How it compares
At 2.4 KB the file is larger than 12 percent of the 2,529 plain-text llms.txt files in this edition, and its 17 links put it ahead of 29 percent of them on link count. The home page declares no generator. Size bucket: 2 to 10 KB. Tranco rank 2,945. Category: Top 10,000, no category.
Live file: https://phys.org/llms.txt. Read 4 November 2026. If the file has since changed or gone, the live URL is the authority; this page records what the crawl read on that date.
Sources
- phys.org llms.txt https://phys.org/llms.txt, read 4 November 2026
- llms.txt proposal (llmstxt.org) https://llmstxt.org/, read 4 November 2026
- Tranco list 746WX (crawl universe) https://tranco-list.eu/list/746WX, read 4 November 2026
- Ora: AgentReady launch post (the 86 percent finding) https://ora.ai/blog/agentready-launch, read 4 November 2026
- Ora llms.txt (GET /api/score/{domain} looks up a cached score) https://ora.ai/llms.txt, read 5 November 2026
Last reviewed 5 November 2026