quick explaination: What is dark matter?

Answer 1

It's nothing but a theory. It doesn't factually exist.

Answer 2

Dark matter, which we cannot see becaust it neither reflects or emits electro-magnetic energy - light - is thought to make up 90% ot the mass of the universe. Scientists have some evidence that it may be there because of the bending of lihgt by its gravity. There is some controvercy over what dark matter may be made of. Some say dust and other say elementry particles.

Answer 3

Quick answer: We don't know yet.

Astrophyscists have observed, through careful measurements and analysis, that there appears to be vast quantities of some "stuff" that seem to have consdierable gravitational mass, but it seems invisible so far. Nobody knows what it is exactly.

Answer 4

Undetected mass in universe: matter postulated to exist in the universe because of observed gravitational effects. It is thought to comprise a substantial part of the mass of the universe but remains as yet undetected by direct observation.

Answer 5

hypothetical invisible matter with higher density than visible matter,assumed to make up most of the unknown matter in the universe,presence detected through gravitational effects on visible matter,may explain the phenomena of gravitational lensing
of background objects in galaxy clusters,velocity dispersion of galaxies,etc.

Answer 6

there is the common type of matter that things we can sense and dark matter that cannot be sensed and it goes through the regular matter. Dark matter occurs during cosmic collisions

Answer 7

Hi. A theoretical substance that does not consist of protons, neutron, electrons, nor their anti-particles. : http://www.answers.com/main/ntquery?s=dark+matter&gwp=13

Answer 8

http://en.wikipedia.org/wiki/Dark_matter

This is also a pretty good one,
http://www.answers.com/topic/dark-matter

Hope you find what you need.