- Book chapter
- 2500 words
- Level: all audiences
This chapter from the book The Heavens Proclaim; Astronomy and the Vatican was written by Fr. Christopher Corbally, S.J. and Br. Guy Consolmagno, S. J., both astronomers with the Vatican Observatory. It discusses a number of questions: How can we know when the universe began? When did the first stars appear? How do we know the overall shape of the universe? Is it true that the universe is expanding faster now than it did when it was first formed, soon after the “Big Bang”? Is the universe infinite, or does it have a boundary? Can one think of “space” outside the universe? How many galaxies are there in the universe? Approximately how many stars are there in the largest galaxy that we know of? And how many stars are there in the smallest galaxy? Is it possible to guess from this how many stars are there in the universe? What are the fundamental elements of matter and energy that the universe is made of? And even, how can one calculate the number of piano tuners in a large city?
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Cosmology-QA
