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Ce4K alternatives & similar sites

CE4K - Close Encounters of the Fourth Kind — 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
voicesofthemoon.com ↗	66 match 1 shared topics	Voices of the Moon	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
atlasoftheuniverse.com ↗	65 match 1 shared topics	An Atlas of The Universe	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
closertotruth.com ↗	64 match 1 shared topics	Homepage - Closer To Truth	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
astarcloseup.com ↗	64 match 1 shared topics	A Star Close Up	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
atlasgalactica.com ↗	64 match 1 shared topics	Atlas Galactica – A site about exploring the wonders of the universe.	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
csgazers.org ↗	64 match 1 shared topics	Community Stargazers \| Discovering the Wonders of the Universe — Join Today	en	space-and-astronomy Squarespace Magento	robotsllmsaihumans	emailphone	none
1norton.com ↗	63 match 1 shared topics	Chuck Norton – Citizen of the World	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
astronautoutfitters.com ↗	63 match 1 shared topics	Astronaut Outfitters – Shop the Future	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
astrobaqir.com ↗	63 match 1 shared topics	AstroBaqir: Explore the Wonders of Astronomy \| AstroBaqir	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
astrometrie.com ↗	63 match 1 shared topics	Astrometrie \| The Precision of the Cosmos	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
vortexrealmpro.com ↗	63 match 1 shared topics	Vortex Realm Pro - Exploring Mysteries of the Universe and Beyond	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
3af-spacepropulsion.com ↗	63 match 1 shared topics	Home - 10th EDITION OF THE SPACE PROPULSION CONFERENCE	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
astrocappella.com ↗	63 match 1 shared topics	AstroCappella: A Musical Exploration of the Universe: Home	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
astrosaurus.com ↗	63 match 1 shared topics	Astrosaurus \| Helping amateur astronomers discover the beauty of the night sky	en	space-and-astronomy WordPress WooCommerce	robotsllmsaihumans	emailphone	none
houstonspacesociety.net ↗	62 match 1 shared topics	Houston Space Society – Official Website of the Houston Space Society	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
astroengine.com ↗	62 match 1 shared topics	astroengine.com – Unraveling the fabric of spacetime	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
ccgazers.com ↗	62 match 1 shared topics	Crystal Coast Stargazers \| I have loved the stars too fondly to be fearful of the night. Sarah Williams	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
astramine.dev ↗	62 match 1 shared topics	Find spots worth mining on the Moon	en	space-and-astronomy	robotsllmsaihumans	emailphone	partial · 8

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.