nov 052012
 
Fermi Measures Cosmic 'Fog' Produced by Ancient Starlight

  Astronomers using data from NASA’s Fermi Gamma-ray Space Telescope have made the most accurate measurement of starlight in the Universe and used it to establish the total amount of light from all of the stars that have ever shone, accomplishing a primary mission goal. This plot shows the locations of 150 blazars (green dots) [continue reading]

jul 252012
 
A Pulsar with a Tremendous Hiccup

  Scientists discover a young and energetic neutron star with an unusually irregular rotation   Pulsars are superlative cosmic beacons. These compact neutron stars rotate about their axes many times per second, emitting radio waves and gamma radiation into space. Using ingenious data analysis methods, researchers from the Max Planck Institutes for Gravitational Physics and [continue reading]

apr 032012
 
Fermi Observations of Dwarf Galaxies Provide New Insights on Dark Matter

There’s more to the cosmos than meets the eye.  About 80 percent of the matter in the universe is invisible to telescopes, yet its gravitational influence is manifest in the orbital speeds of stars around galaxies and in the motions of clusters of galaxies. Yet, despite decades of effort, no one knows what this “dark [continue reading]