Galaxies Quiz A >> Astronomy: Exploring Time and Space
TOTAL POINTS 7
1.When first observing the motions of galaxies, astronomers expected objects near the center of galaxies to move more quickly than those at the edges because of (gravity/dark matter) _________. Instead, objects near the center and at the edges move at almost the same speeds because of (gravity/dark matter) ________.
1 point
2.Dust in the disk of our galaxy makes it difficult to see the other side by both reddening and blocking the light. The best way to observe the other side of the Milky Way and map out the motion of gas in the disk of the galaxy is to observe of which wavelength of light because it penetrates across the galaxy:
1 point
3.The vertical motions of stars within the Milky Way are known as:
1 point
4.True or False: As you map the rotation speed of a galaxy, objects further out from the center of a galaxy orbit more slowly, just like planets in our solar system as predicted by Kepler’s Laws of motion.
1 point
5.True or False: Although no one is sure what dark matter is made of, the most likely source of dark matter is isolated black holes that fill the universe.
1 point
6.Elliptical galaxies are red because they are made of mostly ______ stars.
1 point
dead
7.True or False: The most accurate measurement of distance in space is parallax, a direct geometric measurement.
1 point
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