What is true about the flat rotation curves observed in spiral galaxies?
1. The astronomers were wrong--galaxy rotation curves actually decrease with distance.
2. They imply that mass exists beyond the visible edge of galaxies.
3. Supermassive black holes are much more massive than previously thought.
4. Only the Milky Way has a flat rotation curve.
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What is true about the flat rotation curves observed in spiral galaxies?
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