Will Earth Appear Habitable to Alien Astronomers? --NASA: "Ocean Glint May be a Clue"

If an alien astromer was viewing Earth from space, could they tell that this planet is well-suited for life? Are there telltale signatures in the atmosphere or from our oceans? These are some of the questions that controllers of a lunar spacecraft sought to answer when it took a bit of a side mission. Instead of observing the Moon, NASA’s Lunar Crater Observation and Sensing Satellite (LCROSS) briefly looked at Earth.

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