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Projectcerium alternatives & similar sites

Project Cerium — 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 ↗	68 match 1 shared topics	The Cygnus Project	en	space-and-astronomy Ghost	robotsllmsaihumans	emailphone	none
brussels-planetarium.com ↗	66 match 1 shared topics	AstraLoom Observatory \| Planetarium Culture Project	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
karmanproject.org ↗	65 match 1 shared topics	The Karman Project \| For a cooperative future in space	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
declassified.ca ↗	65 match 1 shared topics	DECLASSIFIED - Aliens, UFOs & Secret Government Projects	Canada en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
carpathiansky.com ↗	64 match 1 shared topics	Carpathian Starry Sky - On the Project	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
ddsd.org.uk ↗	63 match 1 shared topics	Martin Nicholson's Astronomical Projects - index.html	United Kingdom en	space-and-astronomy	robotsllmsaihumans	emailphone	none
myspacebase.com ↗	63 match 1 shared topics	Spacebase v2.1.8 \| Space Object Tracking	en	space-and-astronomy	robotsllmsaihumans	emailphone	partial · 8
kathrynneugent.com ↗	63 match 1 shared topics	Dr. Kathryn Neugent	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
minorplanetcenter.net ↗	63 match 1 shared topics	IAU Minor Planet Center	en	space-and-astronomy	robotsllmsaihumans	emailphone	partial · 5
minorplanetcenter.org ↗	63 match 1 shared topics	IAU Minor Planet Center	en	space-and-astronomy	robotsllmsaihumans	emailphone	partial · 5
astroconnect.co.uk ↗	63 match 1 shared topics	AstroConnect UK - Astronomy Blog & Stargazing Community	United Kingdom en	space-and-astronomy	robotsllmsaihumans	emailphone	none
i3atlas.com ↗	63 match 1 shared topics	3I/ATLAS Tracker - Live Interstellar Object Updates	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
cscaobs.org ↗	62 match 1 shared topics	Home - Marmot Observatory	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
igd-usa.com ↗	62 match 1 shared topics	Institute of Holographic Diplomacy \| 2026	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
csgazers.org ↗	62 match 1 shared topics	Community Stargazers \| Discovering the Wonders of the Universe — Join Today	en	space-and-astronomy Squarespace Magento	robotsllmsaihumans	emailphone	none
dehabayraktar.com ↗	62 match 1 shared topics	Deha Bayraktar \| Astrophysics, Visual Storytelling & Strategy	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
leoskyafrica.com ↗	62 match 1 shared topics	Leo Sky Africa \| Space Education & Astro-Tourism Across Africa	en	space-and-astronomy	robotsllmsaihumans	emailphone	none

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.