The one object in the solar system besides Earth suspected of currently having a liquid on its surface is ___________________ _.
Fill in the blank(s) with correct word
Question 2
If the universe is closed and finite, then
a. the universe has a center and an edge.
b. the universe will expand forever.
c. the final fate of the universe will be very cold and of extremely low density .
d. the space-time of the universe is negatively curved.
e. none of the above