The time-honored strategy of looking for oxygen is indeed a good one, study team members said; after all, it’s tough for this gas to build up in a planet’s atmosphere if life isn’t there churning it out.

“But we don’t want to put all our eggs in one basket,” study lead author Joshua Krissansen-Totton, a doctoral student in Earth and space sciences at the University of Washington in Seattle, said in a statement.
SOURCE: https://www.space.com

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