Mathematics, 24.11.2020 01:10 sdfghyuji123

Which discovery by astronomer Vera Rubin helped prove the existence of dark matter? HELP MEEEH :c

Galaxies exist outside of the Milky Way.
The expansion of the universe is accelerating.
Galaxies spin faster than they should, based on their visible matter.
Gas giants form farther from the Sun, where temperatures are cooler.

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Which discovery by astronomer Vera Rubin helped prove the existence of dark matter? HELP MEEEH :c