CNN) -- Are we alone in the universe? Findings by NASA's Kepler space telescope are making that seem less likely.
NASA scientists have announced Kepler has spotted five planets about the size of Earth, orbiting stars in our galaxy.
These planets are orbiting in what is known as the habitable zone, which puts them at a distance from their suns where liquid water could exist. Liquid water is a key ingredient for life to form.
"In a generation we have gone from extraterrestrial planets being a mainstay of science fiction, to the present, where Kepler has helped turn science fiction into today's reality," said NASA Administrator Charles Bolden.
Kepler space telescope spots five Earth-sized planets in our galaxy - CNN.com
NASA scientists have announced Kepler has spotted five planets about the size of Earth, orbiting stars in our galaxy.
These planets are orbiting in what is known as the habitable zone, which puts them at a distance from their suns where liquid water could exist. Liquid water is a key ingredient for life to form.
"In a generation we have gone from extraterrestrial planets being a mainstay of science fiction, to the present, where Kepler has helped turn science fiction into today's reality," said NASA Administrator Charles Bolden.
Kepler space telescope spots five Earth-sized planets in our galaxy - CNN.com