22. In his book, Probability 1, published by Harcourt Brace and Company, 1998, Amir Aczel estimates that the probability of life for any one given star in the known universe is 0.000,000,000,000,05 independently of life for any other star. Assuming that there are 100 billion galaxies in the universe and each galaxy has 300 billion stars, what is the probability of life on at least one other star in the known universe? How does this probability change if there were only a billion galaxies, each having 10 billion stars?