https://hackerpaper.kaipfister.de/p/1404.6458/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=19803106urn:hackerpapers:mention:1404.6458:19803106Thu, 02 May 2019 00:13:51 GMT<p>(Nitpick: those impactors are also meteorites, just big ones; the numbers in the paper I linked numbers are based on probabilities over time of an impactor large enough to get through shielding.) Giant impacts are relatively rare - in the ~13 years of NASA&#x27;s monitoring program, the largest impactor seen on the Earth-facing hemisphere of the moon left a 15m (inner diameter) crater [https://arxiv.org/pdf/1404.6458.pdf], and most have been orders of magnitude smaller. Remember - the Moon has no active tectonics, no atmospheric weathering, and no water or other liquid evaporation/condensation…</p><p><a href="https://hackerpaper.kaipfister.de/p/1404.6458/">Paper and discussion history</a>. A mention is not an endorsement.</p>astro-ph.EP