As far as I can tell, the Bible is silent on the question of life that lives somewhere other than earth, with one exception -- angels.
Several passages in the Bible refer to the stars of heaven and the angels interchangeably, and other passages discuss angels in heaven or cast out of heaven to the earth.
Genesis 28:12, Judges 5:20, Job 38:7, Psalm 8:4-5, Psalm 147:4, Matthew 18:10, Matthew 22:30, Matthew 24:29-30, Mark 13:25-26, Revelation 1:20, Revelation 12:4
Revelation 12:9 (KJV)
9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.
My understanding is that such passages have led to a popular belief that every star (especially the "morning star" and similar stars later redefined as "planets") has an associated angel, much like Matthew 18:10 leads to the popular belief that every child has a guardian angel.
(This idea -- that each planet has at least one angel associated with it -- and other ideas that Mason Wheeler mentions -- is a big part of C. S. Lewis's fictional trilogy beginning with "Out of the Silent Planet").
