102 Scott Adams: No big deal. Just oxygen on Mars. (twitter.com) posted 301 days ago by Donald17 301 days ago by Donald17 +102 / -0 6 comments share 6 comments share save hide report block hide child comments Comments (6) sorted by: top new old worst You're viewing a single comment thread. View all comments, or full comment thread. ▲ 4 ▼ – Big_Dick_Energy 4 points 300 days ago +4 / -0 Oxygen (as atmospheric O2, O3, etc.) is considered a classic biosignature, you're absolutely right, but there are abiotic mechanisms that produce it. Mars wouldn't be red if it weren't for oxygen! If you'll accept arXiv as a source, this is an interesting paper: Identifying Planetary Biosignature Impostors: Spectral Features of CO and O4 Resulting from Abiotic O2/O3 Production permalink save report block reply
Oxygen (as atmospheric O2, O3, etc.) is considered a classic biosignature, you're absolutely right, but there are abiotic mechanisms that produce it.
Mars wouldn't be red if it weren't for oxygen!
If you'll accept arXiv as a source, this is an interesting paper: Identifying Planetary Biosignature Impostors: Spectral Features of CO and O4 Resulting from Abiotic O2/O3 Production