Mid-Phanerozoic Exoplanets Might Be Easier to Detect than Modern Earth
In a new study, astronomers modeled the atmospheric composition and transmission spectra of five stages in Earth’s Phanerozoic Eon. Two key biosignature pairs — oxygen and methane, and ozone and methane — appeared stronger in models of Earth roughly 100 million to 300 million years ago, when oxygen levels were significantly higher.
https://www.sci.news/astronomy/mid-phanerozoic-exoplanets-12417.html #MidPhanerozoic #Exoplanets #Detection #biosignature #oxygen #methane #ozone