Scientists just made a huge announcement: Telescopes around the world recorded a source of mysterious, ultra-high-energy cosmic rays, the highest-energy particles that hit the Earth. It all started with a text message.
Tagged With particle astrophysics
Every so often, protons and even entire atomic nuclei strike the Earth with extremely high energies—much higher than what scientists can produce in their most powerful physics experiments. Since the discovery of “cosmic rays” a hundred years ago, no one knew for sure where the most energetic of these particles came from—until now.
The search for dark matter -- the stuff that seems to make up most of the mass in the Universe, but which is invisible to us -- is loaded with new ideas, tantalising hints, and incredibly advanced experiments. Unfortunately, none of science's best efforts have yielded any definitive proof of dark matter's identity.