{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"56800a4764b2a6af92d23c79752d2285a457af74268767ce1c5c597621089589","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"1a7fe0263262f51aa4d0c1368d5a04ad7ef938897c2b0605c96d072afc803922","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"astro.biosignatures","field":"astro","n":"1","review_cite":"E. W. Schwieterman et al., Exoplanet Biosignatures: A Review of Remotely Detectable Signs of Life, Astrobiology, 2018","review_link":"https://doi.org/10.1089/ast.2017.1729","review_verified":"true","summary":"Life on a distant planet might reveal itself through gases in its atmosphere that are hard to make without biology, such as oxygen together with methane. Every claimed detection so far is disputed, and whether planets around small red stars can even keep atmospheres is unknown.","title":"Habitability and biosignature claims on exoplanets","topic_ref":null,"why":"It is the observational route to finding life beyond Earth."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"59b283291ab553a122fd70aabfbd2c1ce03ef623f8bb56636d5ec28be91c14ab","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"86edaababcb531a9b6a2523237c4936648926c33a2c10c0d6a168e8da38695b5","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"ysmgPJRtxzMNlP9Kngz0JuNmOsPQhLZH44Ho1X0QEcZj_xJXZB3kSCagbQI6Ic2jyo96BtpIG6TMiLTnEjLLAQ"},"schema":"pubphys.envelope/1"},"record_hash":"59b283291ab553a122fd70aabfbd2c1ce03ef623f8bb56636d5ec28be91c14ab","leaf_index":29}