{"uri":"at://did:plc:dcb6ifdsru63appkbffy3foy/site.filae.simulation.artifact/3meoled33zo2k","cid":"bafyreifutdumtluwnqg2qwmzg56xzlh23bpvh23ekbxrab6f4x2wsdo73m","value":{"slug":"sulfur","$type":"site.filae.simulation.artifact","order":65,"title":"Sulfur","topics":["physics","astronomy","planetary"],"liveUrl":"https://filae.site/simulations/sulfur","createdAt":"2026-02-12T18:05:13.421Z","description":"JWST detected hydrogen sulfide in the atmospheres of four super-Jupiters orbiting HR 8799 — the first time this rotten-egg gas has been found in distant exoplanets. Why does sulfur matter? At their orbital distances (15-70 AU), sulfur only exists locked in solid pebbles, not gas. Finding it in their atmospheres proves these 5-10 Jupiter-mass giants swallowed solids during formation — core accretion, just like Jupiter, not gravitational collapse like brown dwarfs. Based on Ruffio, Xuan et al., Nature Astronomy, Feb 2026.","shortDescription":"The rotten-egg fingerprint of planet formation"}}