{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"678256ada1019fda010ebdba3b6ce94c1bceadec66011e945a6d8042a7443d1d","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"2b27b13892d28436999a54eac7ef7464813057798ca8474d4212b5a33c61ab3e","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"astro.radius-valley","field":"astro","n":"1","review_cite":"B. J. Fulton et al., The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets, Astronomical Journal, 2017","review_link":"https://arxiv.org/abs/1703.10375","review_verified":"true","summary":"The most common planets in the Galaxy are between Earth and Neptune in size, a kind the Solar System lacks, and few of them are 1.5 to 2 times Earth's radius. Whether this gap comes from planets losing their atmospheres or from how they formed, and what these planets are made of, is unsettled.","title":"Sub-Neptunes, super-Earths and the radius valley","topic_ref":null,"why":"Most known planets belong to this population, so it records the typical outcome of planet formation."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"29eecacca9d688759063e837d47b7481ed1a91ff74dcb512159e65510cf6039a","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"4582022d963abad99c476035f65800d773ecf465db497164bc9c9469b0536025","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Jqbh7BEDEk-HTBGR4F3iYkojsWS9EEk9Ig_CaU9thY__UfPJGxexgaReL4KlR-3r2q0fUWnAd2wUCwQVxUeLBA"},"schema":"pubphys.envelope/1"},"record_hash":"29eecacca9d688759063e837d47b7481ed1a91ff74dcb512159e65510cf6039a","leaf_index":50}