Like a bullet wrapped in a full metal jacket, a high-velocity hydrogen cloud hurtling toward the Milky Way appears to be encased in a shell of dark matter, according to a new analysis. Astronomers believe that without this protective shell, the high-velocity cloud known as the Smith Cloud would have disintegrated long ago when it first collided with the disk of our Galaxy.
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/8...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/8...