{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"3154a9b7210d73e7dbc33b0a9230f2ab402c8738753c9f248980b38aef0cf206","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"072d9e3476ab8b57ac17625ad95709d110f3abf051c0b1b88a945786e950b07a","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"astro.disk-dynamics","field":"astro","n":"1","review_cite":"J. A. Sellwood, Secular evolution in disk galaxies, Reviews of Modern Physics, 2014","review_link":"https://arxiv.org/abs/1310.0403","review_verified":"true","summary":"Disk galaxies like the Milky Way show spiral arms, central bars and ripples in the motions of their stars. How long these patterns last and what made them is still argued over.","title":"Dynamics of galactic disks","topic_ref":null,"why":"Disk dynamics sets how stars move across a galaxy over time and tests the dark matter around it."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"f19e1364f833efe76f28e89a114cdd946c8b004cdb07a402cf8e6ddc3975459a","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"ec7d8746c9c430aa8c112bb1d1fd07a92969fe4edebc0875ae5f8cd70ae0ca20","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"BhMI18x-tHeKD6BGSmua0Iw-TTAxx4MnuTvF6MmwnEHFS41-Gqi8ys6ay1E77LSGlO9i6_AB6UA1sNzV-eEcAQ"},"schema":"pubphys.envelope/1"},"record_hash":"f19e1364f833efe76f28e89a114cdd946c8b004cdb07a402cf8e6ddc3975459a","leaf_index":35}