NASA’s Kepler suggests 17 billion Earth-sized planets in Milky Way

The Milky Way contains at least 17 billion planets the size of Earth, and likely many more, according to a study that raises the chances of discovering a sister planet to ours.

Astronomers using NASA’s Kepler spacecraft found that about 17 percent of stars in our galaxy have a planet about the size of Earth in a close orbit.

The Milky Way is known to host about 100 billion stars, meaning that about one of every six has an Earth-sized planet around it.


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