News From the Field
Failed dwarf galaxy survives galactic collision thanks to full dark-matter jacket
May 23, 2014
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 of data from the Robert C. Byrd Green Bank Telescope. Astronomers believe 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.
National Radio Astronomy Observatory
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