Beyond the habitable zone: Exoplanet atmospheres are next clue to finding life on planets orbiting distant stars

By Spacephototshirts
When astronomers search for planets that could host liquid water on their surface, they start by looking at a star’s habitable zone. Water is a key ingredient for life, and on a planet too close to its star, water on its surface may “boil”; too far, and it could freeze. This zone marks the region in between.
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