Question

1. Another explanation for the Universe it the Steady State Hypothesis. The Steady State Hypothesis says that the Universe has always existed and is infinite in extent. Which of the following support the Big Bang Theory and which support the Steady State Model.
   (Select B-Big Bang Theory, S-Steady State Model, If the first is B and the rest S, enter
   BSSSSS).  
   
   A) Observing that galaxies at very large distances look identical to those in the nearby universe.
   B) The measurement of redshifts that show galaxies appear to be moving away from each other and the Universe is expanding.
   C) The measurement of the microwave background radiation.
   D) A measurement that shows the density of the Universe is close to the critical density.
   E) An observation that some globular clusters show M-type stars that have evolved off the main sequence.
2. 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) Probably the ultimate fate of the Universe will be to collapse into a series of large black-holes.
   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 greater than the critical density the Universe will eventually collapse into a big crunch.
   D) At present the visible matter in the Universe is only about 1 percent of the mass needed to reach the critical density.
   E) It is possible the Universe has undergone a series of big bangs, expansions and contractions.
   F) The critical density is the density needed to cause the Big Bang.
   G) If the density of the Universe is found to be greater than the critical density, the big bang theory must be incorrect.

Answer 1