Cosmic rays seen at Earth show a wide range of particle energies, from 107 electron-volts (eV) to more than 1020 eV, the ...

NASA’s Juno Mission has captured electrons traveling near the speed of light in Jupiter’s magnetic environment, providing ...

New York University physicist Georgi Dvali concludes that the cosmic acceleration of the universe may be caused by the modification of standard laws of gravity at very large distances, and not by &#34 ...

Fading candle: remnant of a type Ia supernova called SNR 0509-67.5. (Courtesy: NASA/CXC/SAO/J Hughes et al/ESA/Hubble Heritage Team) The mysterious substance known as dark energy thought to be pushing ...

Cosmic rays are relativistic charged particles that pervade the Galaxy and beyond, carrying crucial information about violent astrophysical processes and influencing the dynamics of interstellar and ...

In all directions of the sky, cosmic rays rocket through space with incredible speed. These "rays"—which mostly consist of protons—are some of the most energetic particles in the universe. For nearly ...

If it’s possible to make a mystery more mysterious, then a study of dark energy by astronomer Bradley Schaefer of Louisiana State University in Baton Rouge may have done so. Earlier this month, at the ...

Three mathematicians have a different explanation for the accelerating expansion of the universe that does without theories of 'dark energy.' Einstein's original equations for General Relativity ...