Mystery Wave in Milky Way Galaxy Suggests Recent Crash

Mystery Wave in Milky Way Galaxy Suggests Recent Crash

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A mysterious wave discovered in the Milky Way suggests our galaxy is still ringing like a bell from a galactic collision, a crash that possibly occured within the last 100 million years, scientists say. Astronomers discovered that stars north and south of the midplane of the galaxy are distributed differently, suggesting that some recent event perturbed them. The most likely explanation is that a small satellite galaxy or clump of invisible dark matter plowed through the Milky Way, leaving behind the echoes that we see.

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