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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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