Monday, September 15, 2008
Bridge to Nowhere
Dark matter 'bridge to nowhere' found in cosmic void
NewScientist.com news service, Rachel Courtland
More than a dozen galaxies seem to be lined up along a bridge of dark matter inside a region of nearly empty space. This 'bridge to nowhere' could shed light on how small galaxies formed in the early universe.
Galaxies in the universe are arranged in a lacy structure that contains many holes, or voids, that are largely bereft of galaxies. But the voids are not completely empty; astronomers expect they are criss-crossed by filaments of dark matter.
Now, astronomers have found a total of 14 galaxies that appear to be part of a dark matter bridge at least 1.5 million light years long.
The string of galaxies spans just 0.5% of a 'mini-void' – a region of space containing mostly dim, dwarf galaxies kept small by their relative isolation from other matter. But the underlying dark matter bridge may be far longer than that.
More information HERE