Build-ups of toxic gases in the atmospheres of many exoplanets in the 'habitable zone' could limit the 'safe zone' in which life outside our solar system could actually exist.
To date, scientists have identified nearly 4,000 exoplanets, a handful of which could potentially contain the right conditions for life to exist.
"Imagine a 'habitable zone for complex life' defined as a safe zone where it would be plausible to support rich ecosystems like we find on Earth today," Timothy, Lyons, a co-author of the study from Riverside, said in a statement."Our results indicate that complex ecosystems like ours cannot exist in most regions of the habitable zone as traditionally defined."
On Earth, most complex aerobic life—organisms that survive and grow in oxygen-filled environments—are limited by even relatively low levels of carbon dioxide. Using this knowledge, the scientists predicted that just by taking into account carbon dioxide toxicity, only up to half of the traditional habitable zone would actually be capable of hosting simple life.
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