Abstract
For decades now, and with ever-increasing sophistication, people have been searching the universe for signs that they are not alone. Rovers are probing the surface of Mars. Scientists are planning missions to other promising spots such as Saturn's moon Enceladus and Jupiter's moon Europa, both of which may harbor liquid water. The James Webb Space Telescope, scheduled for launch in 2018, will let astronomers sample the atmospheres of exoplanets for chemical signatures of life. And radio astronomers have long been listening for transmissions from intelligent extraterrestrials. Here, Holmes discusses the search for alien life.
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