Choose the correct statements from the following list. (Give ALLcorrect answers, i.e., B, AC, BCD...)
A) A major difference between dark matter and dark energy is thatone causes the univserse's expansion to slow down, the other tomake it expand faster.
B) The critical density is the density needed to cause the BigBang.
C) Assuming no dark energy, if the matter density of the universeis less than critical, the universe is open.
D) The inflationary model of the universe solves both the flatnessand the horizon problems.
E) Assuming no dark energy, if the matter density of the universeis greater than critical, the universe is will expandforever.
F) Observations show us that the geometry of our universe must bevery closed
G) The horizon problem in cosmology is that regions of the universethat should not have ever had thermal contact with one another havethe same temperature.
