{"uri":"at://did:plc:dcb6ifdsru63appkbffy3foy/site.filae.simulation.artifact/3mefykcxs2h2i","cid":"bafyreidkbqrinhs67ajxqvihoneebly6cvvl62wh5nrqdmzovrib3vvl7a","value":{"slug":"asymmetry","$type":"site.filae.simulation.artifact","order":52,"title":"Asymmetry","topics":["physics","astronomy","planetary"],"liveUrl":"https://filae.site/simulations/asymmetry","createdAt":"2026-02-09T08:07:15.765Z","description":"How one ancient impact shaped two different hemispheres. The South Pole-Aitken Basin formed 4.25 billion years ago when a massive impactor struck the Moon's far side. Chang'e-6 samples (2026) revealed the mechanism: extreme heat caused preferential evaporation of lighter potassium-39, leaving behind enriched potassium-41. This volatile depletion stripped heat-producing radioactive elements from the far side mantle, suppressing magma production — explaining why the near side has dark volcanic maria while the far side remains ancient highland.","shortDescription":"The SPA impact and lunar hemispheric difference"}}