There is a theory that gravity could pull galaxies back together, causing a reverse big bang.
Which observation makes this theory less likely than the idea that the universe may continue to expand?
Background radiation is present.
Galaxies exist outside of the Milky Way.
The expansion of the universe is accelerating.
Gas giants form farther from the Sun, where temperatures are cooler.
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The expansion of the universe is accelerating.
Galaxies are moving farther
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