A NASA satellite that’s been orbiting as space junk since 1967, Relay 2, emitted an unexpected, powerful radio burst that ...

Astronomers studying a distant galaxy cluster stumbled upon ancient radio signals that might hold clues to the formation of ...

A communications satellite out of commission since 1965 is chirping at the Earth in radio frequencies. What is happening? We ...

LOFAR detects a faint radio 'mini-halo' from 3.8 billion years ago, revealing how galaxy clusters evolved in the early ...

New research from physicists at Peking University, China, suggests that some pulsars may have massive mountains on them, ...

After taking a closer look, however, the team realized that the only viable source for the burst was NASA’s dead Relay 2, a ...

A faint radio glow reveals a million-light-year halo enveloping one of the earliest galaxy clusters, hinting that energetic ...

A NASA experiment has picked up bizarre cosmic whispers—and they’re defying everything we thought we knew about particle physics.

Caltech simulations reveal what happens when black holes collide with neutron stars—violent cracking, intense shock waves, ...