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1 | | What is meant by the statement that "a telescope is a time machine"? |
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2 | | How old is the most recent information we can ever have about the planet Pluto? |
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3 | | What is the Hubble classification of an elliptical galaxy that appears spherical in shape? |
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4 | | What is the Hubble classification of a barred spiral with tightly wound arms? |
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5 | | How can the stars in an elliptical galaxy be orbiting the center of the galaxy if the galaxy has essentially no angular momentum? |
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6 | | What is the relationship between the sizes of the nuclei of spiral galaxies and how tightly the spiral arms of those galaxies are wound? |
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7 | | Why is a galaxy much more likely to collide with another galaxy than a star is to collide with another star? |
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8 | | What is believed to be the way that ring galaxies are produced? |
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9 | | What evidence do we have that there is dark matter in spiral galaxies? |
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10 | | What evidence do we have that there is a massive black hole in the center of the Andromeda Galaxy? |
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11 | | What are some of the objects that serve as primary distance indicators in determining the cosmic distance scale? |
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12 | | Why can't primary distance indicators be used to find the distances of very distant galaxies? |
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13 | | Suppose we were to discover that all of the galaxies are actually ten times farther away than previously thought. What effect would this have on the value of Hubble's constant? |
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14 | | Describe how Hubble's law is explained as a consequence of the expansion of the universe. |
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15 | | Suppose we lived in a universe in which the greater the distance to a galaxy, the faster that galaxy were approaching us. How could such a relationship between distance and velocity be explained? |
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