The Moon and Mercury can be eliminated as hosts for life because:
A) they do not have an atmosphere and water would boil away into space.
B) they have water in the form of ice.
C) they only have traces of water vapor in their atmospheres.
D) they do not have solid surfaces.
Question 2
Which of the following is true of Saturn's moon Titan?
A) It has extremely high temperature of about 290F.
B) It has oxygen in its atmosphere.
C) It appears to have a liquid-water ocean below its icy crust.
D) It is rich in organic molecules.