10 Things you should know about Dark Matter

Dark matter filaments. Image Credits:
John Dubinski (U of Toronto).

1. �Dark� doesn�t just mean we don�t see it.

It means it doesn�t emit any electromagnetic radiation for all we can tell. Astronomers haven�t been able to find neither light visible to the eye, nor radiation in the radio range or x-ray regime, and not at even higher energies either.
2. �Matter� doesn�t just mean it�s stuff.