Let's take a look inside Uranus.If “dark matter” couples to gravitation, why don’t we see any evidence of their conglomerates crashing into other celestial bodies?
Sort of the “un”iverse instead of the “uni”verse.
Visible normal matter and invisible dark matter respond to gravity in a similar way, forming clouds of stars, the galaxies. The first tip-off was that for the amount of matter seen through a telescope, the implied mass seen should have a certain rate of spin. The galaxies actually were turning much too fast, which was only possible if they had an unseen component adding extra heft.
The dark matter and normal matter interact through gravitational attraction, so a grouping of the two tend to approach an average velocity when intermixed. A missing component for dark matter is the lack of interaction with light, thus no photon acceleration of matter as with a solar sail. Based on that difference, the dark matter will always find a path which deviates somewhat from the normal matter grouping. Other properties may apply such as carrying a static charge or self repulsion? May not stick together to build large bodies; but, still has a gravitation component.
Another observation is the bending of light from distant galaxies by something invisible in the foreground. Sometimes a duplicate image of the distant galaxy is visible offset from the primary location, or a distorted ring of light is present, with the observed galaxy at the bulls-eye. Gravity warps space—bends light, therefore has an effect like an optical lens to form, or sometimes distort an image.
Let's take a look inside Uranus.SNOLAB: Doing Science in an Active Mine
I'm a genius!
The “Big Freeze” theory needs to explain what will become of black holes. If all matter expands to the point where even the smallest particles are widely separated those black holes which have sucked up enormous volumes of matter, to the point where the gravitational pull allows nothing to escape, must have to come apart to allow that matter to scatter.
Also, perhaps black holes, which didn’t exist until the time had passed for large stars to form, live their lives and then explode, are the generators of dark energy which is also a late comer to the universe. As time passes more black holes are formed which coincides with the increase in dark energy.
Just a couple of thoughts.