Scientists Offer Proof of 'Dark Matter'

Analysis of Galactic Collision Said to Reveal Mysterious Substance
This composite image depicts the "bullet cluster" formed by galactic collision,
with hot gas in a bullet shape shown in red and areas of dense matter in blue.
Most of the matter in blue area is "dark," according to the astronomers' analysis.

(NASA/AFP/Getty Images)

An Answer in a Galactic Collision Astronomers say the aftermath of a collision between two galactic clusters provides the strongest evidence yet of the existence of "dark matter" - matter that doesn't emit or reflect anything that can be detected, but whose presence can be inferred from its gravitational effects on visible matter.

This article is courtesy of Dave Lautz's alert this morning.