Scientists still aren't sure how Venus' environment become so out-of-control and inhospitable.
has been the center of attention in the solar system for a long time, it is usually forgotten that Venus is actually the most similar planet to Earth in terms of size and mass," Colby Ostberg, a PhD student at UC Riverside and lead author of the study, told Space.com in an email."In addition, past works have shown that Venus could have maintained habitable surface conditions up until 1 billion years ago, which means thecould have had two habitable worlds in the past.
"Oxygen is often considered a potential exoplanet biosignature because, on Earth today, it is almost entirely the result of photosynthetic life," Dr. Eddie Schwieterman, who is an Assistant Professor of Astrobiology at UC Riverside and a co-author on the study, told Space.com in an email."However, one potential abiotic way of accumulating oxygen in a planetary atmosphere is through an extended runaway greenhouse.
An artist's representation of the 'habitable zone,' the range of orbits around a star where liquid water may exist on the surface of a planet.
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