{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"3e4448ab244b5ba43807e83dd3a0e87f3719b82fb47464d947d4cb8d102bd221","created":"2026-10-03T07:17:55Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"d46757336206b023e9583e633d2d7b260070e321e2f8d4f833f88f5790bf4202","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"astro.interstellar-objects.number-density","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Each detection gives an estimate of how many such bodies fill space between the stars. This tells how much material planetary systems throw out while forming.","posed_since":"2017","precise":"Determine the space density $n(>D)$ and size distribution of interstellar objects near the Sun; the detection of 1I implied $n \\sim 0.1-0.2\\,\\mathrm{AU}^{-3}$ for $D >\\sim 100\\,\\mathrm{m}$. Convert this into the mass of solids ejected per star and compare with planet-formation ejection models. The answer is $n(>D)$ with uncertainty and the inferred ejected mass per star.","problem_ref":null,"references":"","settled_by":"A detection rate with a well-characterized selection function from Rubin Observatory LSST over several years.","status_note":"","title":"How many interstellar objects are there, and of what 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