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2. We are not alone Roughly how long would it take to count all the stars in the Milky Way Galaxy at a rate of one star per second? Answer in years using scientific notation.
4. Whats that Angle? (a) The Orion Nebula is shown in the figure below. It is 1500 lightyears from Earth and about 30 lightyears across. Use this information to determine the angular diameter (angular size) of the Orion Nebula. Give your answer in degrees. (b) How does the angular diameter of the Orion Nebula compare to the angular diameter of the Moon?
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