mei 262013
 
Galaxies Grow by Funnels of Cold Gas

  Computer simulations of galaxies growing over billions of years have revealed a likely scenario for how they feed: a cosmic version of swirly straws.  Created with the help of supercomputers, this still from a simulation shows the formation of a massive galaxy during the first 2 billion years of the Universe. Hydrogen gas is [continue reading]

sep 252012
 
Milky Way is Surrounded by Huge Halo of Hot Gas

  Astronomers have used NASA’s Chandra X-ray Observatory to find evidence our Milky Way Galaxy is embedded in an enormous halo of hot gas that extends for hundreds of thousands of light-years. The estimated mass of the halo is comparable to the mass of all the stars in the galaxy. This artist’s illustration shows an [continue reading]