25. Which tools do astronomers use to determine the effects

25. Which tools do astronomers use to determine the effects of collisions between galaxies?For help...watch THIS * 1 point
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Which tools do astronomers use to determine the effects of collisions between galaxies? Select the two correct answers.(1 point)
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Which tools do astronomers use to determine the effects of collisions between galaxies? Select the two correct answers.(1 point)
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Which tools do astronomers use to determine the effects of collisions between galaxies? Select the two correct answers.(1 point)
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Which tools do astronomers use to determine the effects of collisions between galaxies? Select the two correct answers.(1 point)
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Which tools do astronomers use to determine the effects of collisions between galaxies? Select the two correct answers.(1 point)
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Which tools do astronomers use to determine the effects of collisions between galaxies? Select the two correct answers.(1 point)
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