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In [[astronomy]] and [[cosmology]], '''dark matter''' is a hypothetical [[form]] of matter that is undetectable by its emitted [http://en.wikipedia.org/wiki/Electromagnetic_radiation electromagnetic radiation], but whose [[presence]] can be [[infer]]red from [[gravitational]] [[effects]] on visible [[matter]].[1] According to [[present]] [[observations]] of [[structures]] larger than galaxies, as well as [http://en.wikipedia.org/wiki/Big_bang Big Bang cosmology], dark matter and dark [[energy]] could account for the vast majority of the (missing) [[mass]] in the observable universe.

In [[astronomy]] and [[cosmology]], '''dark matter''' is a hypothetical [[form]] of matter that is undetectable by its emitted [http://en.wikipedia.org/wiki/Electromagnetic_radiation electromagnetic radiation], but whose [[presence]] can be [[infer]]red from [[gravitational]] [[effects]] on visible [[matter]].[1] According to [[present]] [[observations]] of [[structures]] larger than galaxies, as well as [http://en.wikipedia.org/wiki/Big_bang Big Bang cosmology], dark matter and dark [[energy]] could account for the vast majority of the (missing) [[mass]] in the observable universe.