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So the question is, pardon me, does dark matter follow this rule? Does it fall into these gravitational wells the same as everything else? And will it fall into these gravitational wells with the same depth? Should dark matter not be affected by the fifth force of nature, then galaxies, which are mostly dark, will fall into gravitational wells, the fifth force of nature. You can think of that as along the lines of dark energy. It's this energy out there that you can refer to as repulsive gravity. Gravity draws things in, but this repulsive force, or repulsive gravity, they believe is what's driving the universe out at an accelerated rate of expansion. This is repeater station Kilo Kilo 7. If there is a fifth force acting on dark matter, the galaxies would fall into these wells differently. By looking at the depth of the wells, with galaxy velocities in mind, a test for the fifth force can be performed. Research has found that dark matter moves into gravitational wells the same way ordinary matter does. And if a fifth force does exist, it can't exceed seven percent of gravity's strength. So upcoming experiments will be focused on whether there's a very subtle seventh or sixth or fifth force actually, whether it actually has any effect on dark matter.