{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"e56c8fb24aceb5bf55b02d7e0870b3e9dae766d3db569fb035598b4c395041f1","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"6feeb0a98b3ce8cc51bd94831e1ffba04777e4fff0e00e0d75a3cf8e78e87465","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"astro.planetesimal-formation","field":"astro","n":"1","review_cite":"J. Drazkowska et al., Planet Formation Theory in the Era of ALMA and Kepler: from Pebbles to Exoplanets, Protostars and Planets VII (ASP Conference Series 534), 2023","review_link":"https://arxiv.org/abs/2203.09759","review_verified":"true","summary":"Planets grow from microscopic dust in disks of gas around young stars, but grains that reach centimeter to meter size break up in collisions or spiral into the star within a few hundred orbits. How solids get past this to kilometer-size bodies and then to planet cores is not settled.","title":"From dust to planets: planetesimals and pebble accretion","topic_ref":null,"why":"This is the first step in making every planet, including Earth."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"31e036d86c734de67f0897bf2bb6f507ef858098857fb27d31ab4bb1d62da4e6","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"527769cd4cf7e8f2e78e813e10f12a2fa6f81b43da0103caefb4a83caf252d57","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"t2ea6nfKJOJrz_ficXM2lPWtrrRWTxlKXHuAsnlgJnTxhau2X5eUCImISiJYV0CLB6kFtfLoocdYAb52ttr2BQ"},"schema":"pubphys.envelope/1"},"record_hash":"31e036d86c734de67f0897bf2bb6f507ef858098857fb27d31ab4bb1d62da4e6","leaf_index":46}