Q1) At present the universe is expanding, but we are not certain if this expansion will continue forever, come to a stop, or if the universe will ultimately collapse back into itself. Describe at least TWO of the factors that will ultimately determine which of these will occur?

Q2) What is the Big Bang theory of the Universe? In the Big Bang theory of cosmology what assumptions are made? What observations must be explained? What is the past history of this universe according to this theory? Identify and explain one of the competing theories to the Big Bang.

Q3) What does it meant by the term dark-energy? How is this different than dark-matter?

Q4) M31, the great galaxy in Andromeda and a member of the Local Group of galaxies, is approaching us. Does this mean that Hubble's law is wrong? If not, then why would M31 be moving towards us and not away from us? Be sure to DEFINE Hubble's Law as part of your response!