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Gravity. We cannot see or directly detect "dark matter", and the only reason why astronomers talk about "dark matter" is that galaxies like the Milky Way appear to be spinning too fast for gravity to hold them together. Or at least, for the gravity of the mass that we can SEE to hold them together. Gravity comes from matter, and we can't see enough matter, so it must be "dark matter".
This may be in the form of trillions of invisibly-dim brown dwarf stars, or in black holes from which no light ever escapes - or it may be something entirely new. "Dark matter" is the something new.
What else can I help you with?
Is normal matter the opposite of dark matter?
no actually matter is well matter that we can detect but dark matter is there just we can't detect it but we do no it's there because everything is either matter or engery but we can dectect engery so it's darkmatter
Can Astronomer's directly detect dark energy and dark matter?
Dark matter and dark energy have NOT been detected yet, so any ideas about detecting dark energy and dark matter, whether it be directly or indirectly, is speculation for now.
What is a dark matter microscope used for?
A dark matter microscope is used to indirectly detect and study dark matter by analyzing the impact it has on the distribution of visible matter in space. By observing the gravitational effects of dark matter on visible matter, scientists can infer the presence and properties of dark matter particles.
What's the dark matter in the universe?
Dark matter is matter of an unknown type. It is known to exist, due to its gravitational influence, but it is not known what it is made of. There is at least 5 times as much dark matter than "normal" matter.
Telescopes cannot detect?
Telescopes can not detect any radiation for which they were not specifically built. For example, a radio telescope is specifically designed to detect radio waves. Also, telescopes can not detect radiation that is too faint for them. What is too faint depends on the capabilities of the telescope.
How can astronomaers detect dark matter if the cannot observe it correctly?
say my name say my name
What are the properties of dark matter?
Mainly that dark matter interacts with dark matter and with normal matter via the gravitational force; and that it DOES NOT interact with normal matter via any other known force. Or, if there is any interaction, it does so to such a small extent that it hasn't been possible to detect this so far.
What is the use of dark matter?
Dark matter is sort of a cosmic scaffolding, holding galaxies together through sheer abundance, and since it only interacts with matter gravitationally, you cannot see it, and nor can you detect it....yet.
What are the known properties of dark matter?
Mainly that dark matter interacts with dark matter and with normal matter via the gravitational force; and that it DOES NOT interact with normal matter via any other known force. Or, if there is any interaction, it does so to such a small extent that it hasn't been possible to detect this so far.
Why is a neutrino a candidate for dark matter?
Neutrinos are attractive candidates for dark matter because they are known to interact weakly with other particles, making them difficult to detect. They are also abundant in the universe and have non-zero mass, which could contribute to the overall mass content of the universe. However, current evidence suggests that the combined mass of neutrinos is not enough to account for all of dark matter.
Is dark matter Solid liquid or gas?
We do not know as we have not found any dark matter to examine. The only way we detect it and know it exists is due to its gravitational attraction of the ordinary matter we can see. One speculation when neutrinos were discovered to have tiny nonzero masses was that dark matter might be neutrinos. Another speculation is that dark matter is only ordinary matter, but its in another separate universe in a shared higher dimensional spacetime. Nobody knows.
Does the dark matter emits light of other wavelengths?
No. Dark matter emits no EM radiation that we can detect, and we can detect light from galaxies outside the Milky Way over 17 orders of magnitude. Specifically, from radio waves as long as 10 meters to gamma rays of over 1 GeV in energy. Since there is far more gravitational interaction between dark matter and baryonic matter (ie, the stuff we understand) than that occuring between baryons, then it would be truly bizarre that we could not detect any EM radiation coming from dark matter. If it were emitting EM radiation, then we should see more of it than we can see coming from baryonic matter. But we don't see anything. So either dark matter has no EM interaction (ie, no EM radiation) or its EM interaction is so weak and different than that for baryons.
