{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"5b2875856abfa4efba35089bda63b7dff960979cf49b03595ab12694bc192841","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"bc109f630108ac394b644fb9d1ecb0cb300f7d46c4651700bcd99d3a1d49635c","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"astro.protoplanetary-disks","field":"astro","n":"1","review_cite":"G. Lesur et al., Hydro-, Magnetohydro-, and Dust-Gas Dynamics of Protoplanetary Disks, Protostars and Planets VII (ASP Conference Series 534), 2023","review_link":"https://arxiv.org/abs/2203.09821","review_verified":"true","summary":"Young stars are surrounded by flat disks of gas and dust that feed the star and build planets, and the disks vanish within a few million years. What makes the gas fall onto the star, how much material the disks really hold, and what clears them away are all uncertain.","title":"Protoplanetary disk accretion, mass budget and dispersal","topic_ref":null,"why":"Every planet-formation model takes the disk mass, turbulence level and lifetime as inputs, and these inputs are poorly measured."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"8ff53117308df146f6983fc1ee6578221825c827c392f4ce6c47231d3772e7ef","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"554879751e93a1df3973da3b6b85b8ab91391cfeeb8c7a7a723f3d40c0ed0b70","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"X2Gm42nfAVGLwXkMyBIimXOZWFfMlr632AJOqHFZdP4ULhS_0UPZOod-vhJ7Jr-ueD6lP-kjRRLOeZL634sXBA"},"schema":"pubphys.envelope/1"},"record_hash":"8ff53117308df146f6983fc1ee6578221825c827c392f4ce6c47231d3772e7ef","leaf_index":47}