which discovery by astronomer vera rubin helped prove the existence of dark matter? galaxies exist outside…

which discovery by astronomer vera rubin helped prove the existence of dark matter? 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.

which discovery by astronomer vera rubin helped prove the existence of dark matter? 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.

Answer

Brief Explanations:

Vera Rubin observed that galaxies spin faster than expected based on the amount of visible matter they contain. This led to the hypothesis of dark matter providing additional gravitational pull. The other options are not related to her work on dark - matter evidence.

Answer:

C. Galaxies spin faster than they should, based on their visible matter.