Dark matter is matter that is inferred to exist from gravitational effects on visible matter and background radiation, but is undetectable by emitted or scattered electromagnetic radiation.
Depends what you mean by "a lot." The gravitational effect of dark matter -- whatever the stuff happens to be -- is about six times greater than that of all the visible matter in our Universe.
Since dark matter has mass, it is able to warp time and space, which also makes it able to bend light. The effect of dark matter on space-time (and, therefore, light) is the same as that of regular matter.
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.
Dark matter is everywhere, there really is no place that has the most dark matter.
Dark matter is an unknowm form of matter.
The opposite of dark matter is visible matter.
Dark matter's strength is proportional to it's mass. This means that more dark matter in one spot is stronger then a little bit of dark matter in that same spot.
dark matter
Dark Matter
The word "opposite" is ill-defined here. Also, we really don't know what dark matter is, so it's kind of pointless to talk about its "opposite", whatever that is supposed to mean.
Cold Dark Matter was created in 1992.
Hooray for Dark Matter was created in 2005.