2.11 Quiz 3
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From collisions between other galaxies
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Most irregular galaxies are thought to have formed ________.
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- irregular - elliptical - spiral
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What are the basic shapes into which astronomers classify most galaxies?
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Continue to expand and cool forever
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At present, scientists expect the universe to _______.
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Have liquid water
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In looking for other planets that might have life, astronomers focus especially on finding planets that ________.
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Local
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The Milky Way is located in the ________ Group.
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Did early life arise spontaneously or did it come from space?
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Which of the following is an unanswered question about life on Earth?
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Matter
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Unexpected orbital velocities of stars around the centers of galaxies led astronomers to predict the existence of dark _______.
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Stars symmetrically dispersed in a spherical or flattened shape
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An elliptical galaxy has _______.
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Barred spiral
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The Milky Way is a ______ galaxy.
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Cluster
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The least common shape for a galaxy is ________.
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The Milky Way will collide with Andromeda in 3 billion years forming an elliptical galaxy
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What do astronomers expect will eventually happen to the Milky Way galaxy?
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