Dark Matter?

Question

Ok so I know that 99.9% of the universe's density is due to dark matter. Any Ideas on this?

Answer 1

according to theories, when the big bang occurred, all matter and energy were distributed evenly. however, if all matter and energy were distributed evenly, then there would be no solar systems, planets, or anything. so, scientists decided to measure the mass of galaxies in different ways. instead of measuring the mass using star light; they used the movement of the galaxies to figure out the mass. The results from the second way were greater than that of the first. So, scientists knew that there must be some invisible mass that is upsetting the equality and forming clumps of matter. And that is what dark matter is.
hope that was what you were looking for

Answer 2

Only one-quarter of the universe's density is due to dark mater. Furthermore, we know quite a lot about dark matter: upper limits on its interaction with normal matter, its typical random velocity, the degree to which it clusters under gravity, the effect it has on the formation of galaxies. Dark matter can be detected through its effect as a gravitational lens. Dark matter is probably some difficult-to-detect particle, such as "axions". More is being learned about dark matter every day, and it's getting less mysterious all the time.

Answer 3

Actually, only roughly 22% of the universe is thought to be composed of dark matter. Roughly 74% is thought to be dark energy. The remaining 4% is baryonic ("normal") matter and energy. But if "normal" is defined by the masses, then what we observe is far from normal. But because dark matter and energy is impossible to directly observe with light telescopes, we can only detect it through radio waves and inference. Recently a large glaxy of dark matter was discovered by a British led team, this being the first galaxy to be found composed completely of dark matter. However, it seems that the mysterious nature of dark matter makes it very difficult to study. So far our knowledge is fairly limited, and my only thought is that dark matter is new form of matter altogether. And by new I mean new to humans, as dark matter has likely existed since the big bang.

Answer 4

first wtf is a resercer i think liar is what you meant to say that being said we have no real answer to this question for as you see every source you urn to has a different opinion on the subject merely because we haven't had enough research done on the topic . i have however done some reading and what i want to know is if dark matter is not able to be seen with the human eye and there is at least one galaxy composed fully of dark matter then what if there is life made of dark matter how would we know they could be all around us ,this could explain the ever changing magnetic field of earth { if we wanted to pretend not to know why it changes} so that's it hope that helps :-) science is after all not about answering questions but about knowing what questions to ask.

Answer 5

The common belief used to be that "space" was simply a vacuum...that it was empty and void. Einstein came along and theorized that space wasn't an empty void, but that it was an actual "substance." This substance, i believe, is what dark matter refers to. We can't measure it or "see" it, but it exists . in fact, it can actually be curved due to large objects (such as the sun, planets) which is what causes gravity. Dark matter simply means substance that we cannot measure or see

Answer 6

that's correct
dark matter has been observed. It is not a "fake" concept as implied above ^^
simply means there's a great deal of the universe we don't understand
dark matter and dark energy are key for the universe to continue to expand, and for that expansion to be speeding up (as it is)

Answer 7

Well, half percent of one percent is 0.5% but I don't know of what. And than how to get 256 NYs from that. That is the same way scientists around world tray to explain us "dark matter". When someone get true idea we will now, until then we can continue to chat.

Answer 8

Astronomy can't see the entire universe yet and I believe they are actually calculating just how much they don't see and don't know it. They just call it dark matter which basically means unknown matter.

Answer 9

acually it is 98% And if anybody can harness dark matter even just one half of one percent. They would be able power 256 New Yorks.Of course the equitment would cost over 579 billions dollars so good luck trying it

Answer 10

Hi. I always felt that it may be virtual particles popping into existence long enough for gravity to be felt but short enough so as to not leave detectable photons.