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Astronomy
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Galaxy Mergers and Tidal Interactions
Grade Level
Astronomy
AST.234 Galaxy Mergers and Tidal Interactions
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Which observation would best show that a galaxy had a close encounter in the past even if the companion is no longer obvious?
A
An unchanged pattern of symmetric spiral arms
B
A perfectly smooth round outline with no outer features
C
A single foreground star close to the galaxy in the sky
D
Faint shells and loops of stars around the galaxy
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