Question

4. [4pt]
Choose the correct statements from the following list referring the possible futures of a Universe that does NOT contain Dark Energy. (Give ALL correct answers, i.e., B, AC, BCD...)

A) At present the visible matter in the Universe is only about 1 percent of the mass needed to reach the critical density.
B) The critical density is equivalent to only six atoms of hydrogen in a volume the size of a typical closet (about one cubic meter).
C) If the density of the Universe is found to be greater than the critical density, the big bang theory must be incorrect.
D) The critical density is the density needed to cause the Big Bang.
E) Probably the ultimate fate of the Universe will be to collapse into a series of large black-holes.
F) If the density of the Universe is less than the critical density the Universe will eventually collapse into a big crunch.
G) It is possible the Universe has undergone a series of big bangs, expansions and contractions.

Answer 1