Dark matter is believed to play a central role in [[structure]] formation and galaxy [[evolution]], and has [[Measure|measurable]] [[effects]] on the [http://en.wikipedia.org/wiki/Anisotropy anisotropy] of the [http://en.wikipedia.org/wiki/Cosmic_microwave_background cosmic microwave background]. All these lines of [[evidence]] suggest that galaxies, clusters of galaxies, and the [[universe]] as a whole contain far more [[matter]] than that which interacts with electromagnetic radiation: the remainder is frequently called the "dark matter component," even though there is a small amount of [http://en.wikipedia.org/wiki/Baryonic_dark_matter baryonic dark matter]. The largest part of dark matter, which does not interact with electromagnetic radiation, is not only "dark" but also, by definition, utterly [[transparent]]. | Dark matter is believed to play a central role in [[structure]] formation and galaxy [[evolution]], and has [[Measure|measurable]] [[effects]] on the [http://en.wikipedia.org/wiki/Anisotropy anisotropy] of the [http://en.wikipedia.org/wiki/Cosmic_microwave_background cosmic microwave background]. All these lines of [[evidence]] suggest that galaxies, clusters of galaxies, and the [[universe]] as a whole contain far more [[matter]] than that which interacts with electromagnetic radiation: the remainder is frequently called the "dark matter component," even though there is a small amount of [http://en.wikipedia.org/wiki/Baryonic_dark_matter baryonic dark matter]. The largest part of dark matter, which does not interact with electromagnetic radiation, is not only "dark" but also, by definition, utterly [[transparent]]. |