the end of Kepler 's mission -- whether life in the universe could be widespread . Astronomer : There may be 100 billion Earth-like planets in the Milky Way . If any of them have liquid water , they are likely to have some type of life , he says . Comment: NASA 's Kepler mission to search for habitable planets in our corner of the galaxy .
Astronomer : There may be 100 billion Earth-like planets in the Milky Way . If any of them have liquid water , they are likely to have some type of life , he says . Comment: NASA 's Kepler mission to search for habitable planets in our corner of the galaxy .