Across the observable universe, galaxies advertise themselves in radio waves for familiar reasons-magnetic fields, cosmic rays, and, in those cases where it’s relevant, matter spiraling into a central ...

For decades, humanity has scoured the cosmos for any signs that we aren't alone in the universe. NASA spacecraft like the twin Voyager probes – launched in the 1970s bearing the iconic Golden Record – ...

If so, why haven’t they said hello? The humble residents of this pale blue dot have been on a quest to find an alien civilisation for more than a century. First, it was the “canals” of Mars. Then ...

When astrobiologists are asked what aliens might look like, many now point not to distant galaxies but to some of the ...

Solar winds and coronal mass ejections may scatter narrow signals, making them harder for Earth-based telescopes to detect. The SETI Institute uses radio telescopes to search for signs of intelligent ...