jun 212012
 
Cosmic Web of the First Stars Unveiled

  Scientists have discovered a new way to detect the first stars when the Universe was in its infancy at a mere 1% of its present age. The difference between the velocity of dark matter and that of ordinary matter (baryons, i.e., gas consisting of mostly hydrogen and heium). The velocity difference is small in [continue reading]

mei 202012
 
SkyMapper May Shed Light on Dark Matter

  Astronomers believe that 90% of our universe is composed of dark matter, a mysterious substance that we can’t directly see. Add to that dark energy, a force that seems to be accelerating the expansion of the universe and the picture you get is of a very strange universe much of which we don’t currently [continue reading]

apr 192012
 
Where Do the Highest-Energy Cosmic Rays Come From?

… Probably Not from Gamma-Ray Bursts.   The IceCube Collaboration, in which Berkeley Lab is a crucial contributor, has taken the first steps toward clearing up a cosmic mystery – and made the mystery more intriguing. The IceCube neutrino telescope encompasses a cubic kilometer of clear Antarctic ice under the South Pole, a volume seeded [continue reading]