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Any matter, normal (visible) or dark (invisible), can be noticed by its gravitational attraction. There are several pieces of evidence, all based on the gravitational attraction of some matter that is invisible, but must be there because it has gravitational effects. These include the fact that galaxies rotate way too fast for the amount of known matter, studies on gravitational lensing, and several other pieces of evidence.
What else can I help you with?
Who discovered dark matter?
Dark matter wasn't "discovered" by any one person or group. In fact it is still hypothetical and there is no solid proof for its existence. Various astronomers inferred the existence of dark matter from what they observed about galaxies and galaxy clusters. It is still very much a mystery and the subject of some serious research.
What do scientists think the sun will explode?
I have never heard that scientists think the sun will explode. I do know they predict that our sun will eventually burn out. But its so far away, it takes billions of years for the dark to reach Earth. So I'm not too worried about the sun blowing up or burning out.
What is King Tut's Last name?
archeologists and scientists don't really know what king tut's last name was or if egyptians even had last names for that matter.
What happened to Patrick Henry when he turned 10?
Historians can not know the answer to that question. No data exists. We do know he was hung by the British.
Will there be a big earthquake in LA any time soon?
California sits an a variety of fault lines and it is only a matter of when, not if, a big earthquake will occur. Scientists say it's a certainty. They just don't know the exact time it will happen.
Is there dark matter inside a black hole?
It is currently unknown as scientists do not even know what dark matter is.
What is dark matter and what exists for it?
We know that dark matter exists because it got gravity, though it is invisible. It hold galaxy and Universe. There is a theory there many other parallel universe outside our universe and dark matter holds those universe up and some scientists says that dark matter are just mass of the matter of the parallel universe. It sounds crazy but that is the Law of Physics. However there is not exact explanation of what dark matter really is, so there are still Noble Prices for those who can come up with a reasonable explanation
How are stars dust and gas similar to dark matter?
The only similarity we know of is that they all seem to interact with gravity. Aside from that, scientists do not know what dark matter is.
How do you know dark matter exists?
In the absolute strictness sense, neither I nor anyone else can know dark matter exists. But we DO know that neither the measured velocities of spinning galaxies nor the bending of light from distant galaxies can be explained (1) by the amount of matter we can see in and between those galaxies (2) with our present understanding of gravity. Either there's some mass out there that we can't see OR we don't understand gravity as well as we think we do. Conceptually, scientists prefer solving these discrepencies with (1), as it means we simply have to add some matter to our Universe. What EVER that extra matter happens to end up being, we will, until we know better, simply call it "dark" matter. Thus, ANY use of solution (1) means dark matter exists, even if we don't know its exact nature. Interestingly, the density of dark matter that would explain the first anamoly -- the spin velocity of galaxies -- is about equal to the density that would explain the second one -- the bending of light through inter-galactic space. This strongly suggests solution (1) for both unresolved problems.
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.
Is dark matter excreted from black holes?
No. Black holes do not give off anything other than small amounts of Hawking radiation. That note aside, scientists do not know what dark matter is or what its origin is.
How do you know that matter exists?
If something has mass it is matter.
How do you know dark matter is present?
We know "dark matter is present because it affects the world in ways I do not know of.
How much does dark matter cost per 1ml?
It would be quite difficult to put a price on dark matter as of now, because we don't even know what the stuff IS.
How long is dark matter been around?
If dark matter exists (the jury's still out on that, but it's looking pretty likely), then ... actually, you know what? We still don't really know, because we don't know exactly what dark matter IS. It may have been around since the beginning of the universe, or it may have formed slightly later. Either way, "around 13 billion years" is a good estimate.
Can dark matter kill you?
The whole point of dark matter ... the thing that makes it "dark" ... is that it doesn't interact with normal matter except through the gravitational force (and, possibly, for some potential types of dark matter ... remember that nobody really knows what it actually is yet ... the weak force).One type of dark matter that we know about for sure is neutrinos. Around 65 billion neutrinos per second pass through every square centimeter of your body perpendicular to the direction of the Sun. They have been since you were born ... since before you were born, in fact. Even at night, because they go straight through the Earth too and come up through the ground on the side facing away from the Sun. The kajillion that have already done so haven't killed you yet, it's not all that likely that the kajillion and first is going to kill you.About the only reasonably possible way to die from dark matter would be if there were a lot of it concentrated in one smallish area, in which case you could be pulled apart by tidal forces if you were in a spaceship that went too close to it. This also isn't likely to happen.
What are some possible forms the dark matter in the halo of the Milky Way might be in?
We don't yet know enough about dark matter - or even if it really exists - to be able to speculate on what "form", if any, it might take. You have to remember that "dark matter" is entirely theoretical, based on the supposed fact that the Milky Way doesn't have enough mass to keep it together, and that therefore there must be additional matter that we can't see - "dark" matter - to keep it all together. We've never detected any, nor do we know if we CAN detect any.
