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Stellar Frontiers alternatives & similar sites

Reach New Limits with Stellar Frontiers — 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
3i-atlas.net ↗	66 match 1 shared topics	Interstellar Comet 3I/ATLAS	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
stardistance.net ↗	65 match 1 shared topics	Interstellar Distance Calculator \| 3D Space Calc	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
100yss.org ↗	65 match 1 shared topics	100 Year Starship — Humanity's Interstellar Future	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
100yss.org ↗	65 match 1 shared topics	100 Year Starship — Humanity's Interstellar Future	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
lupexspace.com ↗	64 match 1 shared topics	Lupex Space Pvt Ltd — India's Aerospace Frontier	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
3i-atlas.live ↗	64 match 1 shared topics	ISO Tracker - Evidence-Based Interstellar Object Analysis	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
axelspace.com ↗	64 match 1 shared topics	Axelspace \| Space within Your Reach	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
cosmictext.com ↗	64 match 1 shared topics	Unlocking the Secrets of Cosmic Text: Exploring the Frontiers of Space	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
0gsim.live ↗	64 match 1 shared topics	Zero Gravity Project – The speed of light, the final frontier, to boldly go where no man has gone before.	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
cosmophc.com ↗	64 match 1 shared topics	cosmo ph - Explore the Cosmos with Fun and Educational Online Games for Everyone	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
cosmosfrontier.com ↗	64 match 1 shared topics	IntroductionCosmosFrontier.com - Cosmos, the Ultimate Frontier!	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
3ia.net ↗	63 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 ↗	63 match 1 shared topics	3I Atlas (3I/ATLAS) - Interstellar Object Tracker \| Real-Time Data & Analysis	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	partial · 13
cosmonautadventures.com ↗	63 match 1 shared topics	Cosmonaut Adventures - Train for Space at Star City, Russia	United States~ en	space-and-astronomy	robotsllmsaihumans	emailphone	none
3iatlas.news ↗	63 match 1 shared topics	3I/ATLAS Interstellar Comet Tracker \| Real-Time NASA Webb Observatory Data \| 3iatlas.news	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
cosmosobservatory.com ↗	63 match 1 shared topics	Cosmos Observatory - Explore the Universe with NASA	en	space-and-astronomy	robotsllmsaihumans	emailphone	none
aac-clyde.space ↗	63 match 1 shared topics	AAC Clyde Space \| Space Data & Satellite Constellation Providers	en	space-and-astronomy WordPress	robotsllmsaihumans	emailphone	none
stargazingwithkevin.com ↗	63 match 1 shared topics	Stargazing With Kevin - Stargazing With Kevin Stargazing With Kevin	en	space-and-astronomy WordPress	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.