Does this explain how they can exist without any dark matter?🤔
, an associate professor at the University of Texas at Austin who studies galaxy formation, to discuss the new findings.Mike Boylan-Kolchin: Dark matter is just a catch-all name for something that we don't know exactly what it is. We know that it's something that behaves like matter in the sense that it dilutes as the Universe expands, but it doesn't interact with electromagnetic force. So, it doesn't interact with light, other than gravitationally.
If you did the calculation to determine the mass of the Sun based on the velocity of the Earth’s orbit and came up with a figure that was ten or 100 times more massive than the actual mass of the Sun, that might tell you there was extra mass inside of the Earth's orbit. Of course, we don't see this for the Earth moving around the sun, but it’s typically what you see in galaxies. There’s a missing mass that’s attributed to dark matter.
MB: Other models have been invoked to talk about these observations. A lot of them involve some strong form of interaction between the galaxies in question, and either another galaxy — may be the biggest galaxy in the middle — or something else that would allow the galaxies to be stripped of dark matter and to be puffed up to such a large size. The explanations typically have involved some kind of common denominator of interactions between galaxies.
I think one of the strongest predictions that this hypothesis makes is that the ages of the star clusters in these two galaxies would be the same. That's something we could go out and measure. They know when this event should have happened, so the resulting stars should have formed around the same time. I expect further research on this and further tests to confirm these predictions that this model makes.
Since it can't really interact any other way other than gravitationally, it can't clump up to the high density that we get for the regular atomic matter. That happens because atomic matter can radiate energy, cool off, and do things like that. Dark matter doesn't have the means to cool itself off. So, even though it's very important on very big scales, it’s completely unimportant on small scales, like Earth, the Moon, the Solar System, and even the nearest stars.
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