What really holds galaxies together - Gravity or Dark energy?

1 Answer
Steve S.
Mar 5, 2018

The academic answer is Gravity

Explanation:

Gravity is an attractive force.
If you subscribe to the Dark Energy camp then it is proposed that Dark Energy is the repulsive force expanding the universe, the opposite of gravity.
If you don't subscribe to Dark Energy theory then it is just a fudge because cosmologists got their math wrong.

Related questions
See all questions in Astronomy Basics
Impact of this question
1495 views around the world
You can reuse this answer
Creative Commons License