Dynamics of escaping Earth ejecta and their collision probability with different Solar System bodies · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1108.3375/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTDynamics of escaping Earth ejecta and their collision probability with different Solar System bodies — mentioned by tzshttps://news.ycombinator.com/item?id=6294667urn:hackerpapers:mention:1108.3375:6294667Thu, 29 Aug 2013 07:21:02 GMT<p>I think a lot would depend on the origin of that life. Asteroid and comet impacts with Earth can eject life bearing material into space, and that material can reach the Moon, Venus, Mars, Jupiter, and beyond [1]. Some life forms seem likely to be able to survive that kind of ejection, and a long trip through space, and re-entry in a planetary atmosphere [2]. If we find life on the Moon, or Mars, or Europa, it could turn out to be that it originated on Earth. It would still be an amazing and extremely interesting discovery, but not the momentous discovery that finding true alien life would be.…</p><p><a href="https://hackerpaper.kaipfister.de/p/1108.3375/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.EP