Milky Way is home to at least 100 billion planets

Our Milky Way galaxy is home to at least 100bn alien planets, and possibly many more.

“It’s a staggering number, if you think about it,” lead author Jonathan Swift, of Caltech in Pasadena, California, said. “Basically, there’s one of these planets per star.”

Swift and his colleagues arrived at their estimate after studying a five-planet system called Kepler-32, which lies about 915 light years from earth.