A mysterious radio signal from a distant planet has sparked excitement among astronomers, hinting at the tantalizing possibility of extraterrestrial life.

disc signals, dwarf signals, lower- and upper-quadrant semaphores, motor-car signals, position-light signals, searchlight signals, and smashboards. Check out "Railroad signals 101", "Train signals ...

A U.S. scientist searching for a civilization across 7 Earth clones circling the red dwarf star TRAPPIST-1 says its own alien ...

Unfortunately, the "feasting diet" that one dead star is engaged in signals its relatively imminent ... The rapid spin of this white dwarf, that is vampirically taking stellar matter away from ...

A red dwarf star, paired with a white dwarf ... The discovery adds to an enigmatic group of stars emitting long-period signals, raising questions about their frequency in the Milky Way.

Unfortunately, the "feasting diet" that one dead star is engaged in signals its relatively imminent destruction in a violent supernova explosion. It's the definition of "no pain, no gain." The rapid ...