exam 1 info - Which of the following is the smallest? Size...

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Which of the following is the smallest? Size of a typical star, 1AU, 1 light-second, size of a typical planet According to astronomers, how old is the universe? 14 billion years Where did the elements hydrogen and most helium form? Big Bang On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did the dinosaurs become extinct, 65 million years ago? In late December Recall that a raisin cake is something used to imagine how an expanding universe behaves. Suppose you are in a uniformly expanding raisin cake, sitting A on Raisin A, looking at Raisin B, 2 cm away from you. Raisin B is moving away from you at 1 cm/sec. You observe another Raisin C, which is moving away from you at 3 cm/ sec. How far away is Raisin C? 6cm Polaris is 10 degrees above your horizon? Where are you? Latitude 10 degrees north If the plane of the Moon’s orbit around the Earth were inclined by 0 degrees to the ecliptic plane, a total eclipse of the sun would happen: Somewhere on the Earth once a month Suppose we look at two distant galaxies, Galaxy 1 is twice as far away as Galaxy 2. In that case, We are seeing Galaxy 1 as it looked at an earlier time in history of the universe
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exam 1 info - Which of the following is the smallest? Size...

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