NASA 's Kepler space telescope has discovered Earth - sized planets in our galaxy . That star is some 2,000 light years from Earth . There are five planets in orbit from their stars where liquid water can exist . Liquid water is a key ingredient for life to form .
NASA 's Kepler space telescope has discovered Earth - sized planets in our galaxy . There are five planets in orbit from their stars where liquid water can exist . Liquid water is a key ingredient for life to form .