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MisterBig
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If dark matter has mass, interacts with gravity, and is pervasive then why isn’t it gathering at points of mass and turning all the suns into black holes?
Ah. OK. Could it fall into stable orbits around massive objects or is the reason we do not observe the effect of dark matter’s gravity locally because it has a uniform density throughout the galaxy?silverpig said:Take two large masses of dark matter, separate them, and let them go. They will gravitate towards one another and pass through each other, slow down, stop, and repeat. At least this is what it looks like it does.
MisterBig said:If dark matter has mass, interacts with gravity, and is pervasive then why isn’t it gathering at points of mass and turning all the suns into black holes?
Interesting, and I find the concept of some sort of “super insulated sun” amusing but…cosmoboy said:When a cloud of normal matter collapse by its own gravity its temperature
increased by a large amount. Since normal matter can interact with radiation so it it easy for it to cool by radiative colling. This cooling enhance further gravitational collapse. Since dark matter does not interact with rdaition so it can not cool further and this heat prevents it from further collapse. Conclusion is that dark matter clusters less stronger than normal matter.
MisterBig said:Interesting, and I find the concept of some sort of “super insulated sun” amusing but…
If dark matter cannot interact with itself, why would a dense collection of it cause an increase in temperature? In fact, if dark matter is so weekly interacting, could several particles exist at the same point in space simultaneously?
Dark matter is a hypothetical type of matter that is thought to make up about 85% of the total matter in the universe. It does not interact with light or other forms of electromagnetic radiation, making it invisible to telescopes. Its existence is inferred from its gravitational effects on visible matter.
Dark matter is different from regular matter in that it does not interact with light or other forms of electromagnetic radiation. It also does not emit or absorb any radiation, making it invisible to telescopes. Regular matter, on the other hand, interacts with light and other forms of radiation, making it visible.
The evidence for the existence of dark matter comes from observations of the rotation of galaxies, gravitational lensing, and the cosmic microwave background radiation. These observations cannot be explained by the amount of visible matter in the universe, leading scientists to believe that there must be some other form of matter that we cannot see.
Black holes are regions in space where the gravitational pull is so strong that nothing, including light, can escape from it. They are formed when a massive star dies and its core collapses under its own gravity. Black holes are invisible to telescopes, but their presence can be inferred from the effects of their strong gravitational pull on surrounding matter.
While black holes do not directly interact with Dark Matter, they can have an impact on its distribution in the universe. The gravitational pull of black holes can affect the movement of Dark Matter particles, causing them to clump together in certain areas. This can have an impact on the formation and evolution of galaxies.