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 ...

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

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 ...

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, ...

Want to see cosmic rays? You might need a lot of expensive ... To test the idea that this is from some external source, he takes a smoke detector with a radioactive sensor and places it near ...

To find the cosmic ray electrons, the researchers used the ... scales — meaning it will be difficult for smaller space-based detectors to find them in sufficient numbers. Yet the presence ...

Scientists may have detected dark matter’s first signal through ultra-high-energy cosmic rays. If true, it could challenge Einstein’s theories and rewrite physics forever.