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1)decribe the DIFFERENCE between the FINAL states of the universe a)if the average density of the universe is greater than the critical value b)if it is equal to the critical value

2)if the velocity of recession of the galaxies were not proportional to the distance (v=Hr) but rather proportional to the distance squared v=Hr^2 or proportional to some other power of the distance, then our galaxy would occupy a preffered, central spot in the universe?

3)if you look at the night sky, you see that the distribution of stars is not uniform.What main deviation from uniformity do you see, an to what is this deviation due?

4)the value of the Hubble constant that Hubble had deduced from the available data in 1936 was 1.6*10^5 (m/s)/(million light years) the corresponding expansion time is 1.9*10^9 years. how does compare with the age of the Earth and with the age of the globular clusters? with what problem was Hubble faced?