Abstract
Future probes like NASA's James Webb Space Telescope will scrutinize the atmospheres of planets in other solar systems for possible signs of biological activity. If life spreads between planets, inhabited worlds should clump in space like colonies of bacteria on a Petri dish. Otherwise, Henry Lin of Harvard University says, its signature would be seen on just a few, randomly scattered planets. Lin argues that if people find 25 worlds with life on one side of the sky and 25 lifeless ones on the other, it might mean the sun sits on the edge of a panspermia bubble--a strong sign that life radiated outward
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