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Projectphaethon alternatives & similar sites

Project Phaethon — 18 websites ranked by shared content topics, category and on-page relevance.

Each result shows its full tech stack, contacts and AI-policy — not just a name · Browse all sites in Space And Astronomy →

Domain	Match	Title	Country/Lang	Category	AI files	Contact	AI-protection
cygnusproject.org ↗	67 match 1 shared topics	The Cygnus Project	en	space-and-astronomy Ghost	robotsllmsaihumans	emailphone	none
nakujaproject.com ↗	65 match 1 shared topics	Nakuja Project - Rocket development in Kenya	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
carpathiansky.com ↗	64 match 1 shared topics	Carpathian Starry Sky - On the Project	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
karmanproject.org ↗	64 match 1 shared topics	The Karman Project \| For a cooperative future in space	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
deepnowproject.com ↗	64 match 1 shared topics	THE DEEP NOW PROJECT: THIS MOMENT OF MIRACLES	en	space-and-astronomy Squarespace Magento	robotsllmsaihumans	emailphone	none
brussels-planetarium.com ↗	63 match 1 shared topics	AstraLoom Observatory \| Planetarium Culture Project	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
ddsd.org.uk ↗	63 match 1 shared topics	Martin Nicholson's Astronomical Projects - index.html	United Kingdom en	space-and-astronomy	robotsllmsaihumans	emailphone	none
declassified.net ↗	63 match 1 shared topics	DECLASSIFIED - Aliens, UFOs & Secret Government Projects	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
declassified.ca ↗	63 match 1 shared topics	DECLASSIFIED - Aliens, UFOs & Secret Government Projects	Canada en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
myspacebase.com ↗	62 match 1 shared topics	Spacebase v2.1.8 \| Space Object Tracking	en	space-and-astronomy	robotsllmsaihumans	emailphone	partial · 8
mymessiermarathon.com ↗	62 match 1 shared topics	My Messier Marathon	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
i3atlas.com ↗	62 match 1 shared topics	3I/ATLAS Tracker - Live Interstellar Object Updates	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
ddxa.net ↗	62 match 1 shared topics	Dateline DX Association	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
dundeesat.co.uk ↗	61 match 1 shared topics	Dundee Satellite Station Ltd	United Kingdom en	space-and-astronomy	robotsllmsaihumans	emailphone	none
3ia.net ↗	61 match 1 shared topics	3I Atlas (3I/ATLAS) - Interstellar Object Tracker \| Real-Time Data & Analysis	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
3iatlas.com ↗	61 match 1 shared topics	3I Atlas (3I/ATLAS) - Interstellar Object Tracker \| Real-Time Data & Analysis	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	partial · 13
leeinorbit.com ↗	61 match 1 shared topics	Satellite Propulsion \| The Lee Co.	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
legitfta.com ↗	61 match 1 shared topics	LegitFTA - Free-To-Air Satellite Community	en	space-and-astronomy XenForo	robotsllmsaihumans	emailphone	partial · 1

How the match score works

Each match is a 0–100 similarity score — the higher it is, the more two sites resemble one another. It’s computed automatically from our own crawl data (never from what a site says about itself) by combining several independent signals, so a high score means several of them point the same way:

shared topics how many of the same fine‑grained content topics (IAB sub‑categories) both sites cover — the main signal.
same category whether they sit in the same business / industry category.
content & title how closely their titles and page descriptions line up in wording and meaning.

No single signal decides the result — they’re blended together. Treat the score as a way to rank candidates rather than an absolute percentage; the chips on each result show which signals contributed.