An experiment on the side of an extinct volcano in Mexico involving gamma rays is helping scientists answer a fundamental question in physics: Is the speed of light the same throughout the universe?

Caption: The Crab Nebula. Photo courtesy of NASA. Beginning Sunday, September 18, 2011 at NASA’s launch facility in Fort Sumner, New Mexico, space scientists from the University of New Hampshire will ...

The Tibet ASγ Experiment has successfully, for the first time, measured magnetohydrodynamic (MHD) turbulence on scales below one parsec (approximately 3.3 light-years) within the gamma-ray halo ...

New experiments at CERN by an international team have ruled out a potential source of intergalactic magnetic fields. The existence of such fields is invoked to explain why we do not observe secondary ...