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 ...

Last year, astronomers detected a powerful burst of radio waves from within our galaxy. Researchers now say it came from NASA ...

Learn how a deactivated satellite sends signals from beyond, not by reviving its systems, but by inadvertently setting off ...

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

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

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, ...