Homework Handout 10 - HW10 Due Thursday May 1 If words are required in an answer then the answer should be expressed in a complete sentence If a number

# Homework Handout 10 - HW10 Due Thursday May 1 If words are...

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HW10: Due Thursday May 1 If words are required in an answer, then the answer should be expressed in a complete sentence. If a number is required in an answer, then the number should have the correct number of significant figures, and should include units. If you are asked a multiple choice question, you are required to indicate all correct answers (and there may be more than one). Remember to show all work, and be legible and clear. Your homework should be returned on a separate piece of paper. 1. Recent measurements of the expansion rate of the universe reveal that the expansion rate of the universe is doing something astronomers did not expect. What is that? A) The measurements show that the universe may not be expanding at all. B) The measurements show that the universe may be shrinking rather than expanding. C) The measurements show that the expansion is accelerating, rather than slowing under the influence of gravity. D) The measurements indicate that the universe is at least 30 billion years old, meaning that more than 10 billion years passed between the Big Bang and the formation of the first stars and galaxies. E) The data show that the expansion rate varies widely in different parts of the universe. 2. The temperature of the cosmic microwave background differs by only a few parts in 100,000 across the sky. Compare that level of uniformity to the surface of a table in the following way. Consider a table that is 1 meter in size. a) How big would the largest bumps on that table be if its surface were smooth to one part in 100,000? b) Could you see bumps of that size on the table’s surface? 3. Edwin Hubble discovered that the Universe is expanding. a) Would it be correct to say that due to the expansion of the universe, the Earth is larger today than it was 4.56 billion years ago? Why or why not?

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