For years, astronomers have searched for the origins of ultra-high-energy cosmic rays, the most powerful particles in the universe. These energetic travelers move at nearly the speed of light, packing ...

The name “cosmic ray” itself dates to 1925, when Nobel laureate and former UChicago faculty member Robert Millikan coined the term in a paper in Science. (We’ve since learned that they are particles, ...

Opinion High energy neutrinos are the coolest particles in astrophysics. Born in distant cosmic cataclysms, they speed ...

“Radio purity is a big problem for scientists because they can't get their dark matter detectors with exactly no background ...

A strange energy source at the center of the Milky Way may be a new type of dark matter. Scientists found that hydrogen gas ...

NASA powers down Voyager probes to save power. Instruments shut off to extend life, as the trailblazing spacecraft push the ...

"We would like to understand the difference between these systems, which holds the clue to understand just how many cosmic ...

An X-ray observatory used to study neutron stars is “back in the black” and a cosmic ray detector is ready for possible future upgrades after two astronauts completed a spacewalk outside the ...