The most prolific planet-hunting machine in history has signed off. NASA's Kepler space telescope, which has discovered 70 percent of the 3,800 confirmed alien worlds to date, has run out of fuel, ...

The hunt for intelligent life beyond Earth has quietly entered a more exacting phase, and one small, cool star has become a proving ground for how serious that search can be. TRAPPIST-1, a dim red ...

Thomas Mulligan shares NASA’s plans for an alien-hunting telescope positioned 1.5 million kilometers from Earth by 2040. Donald Trump reacts to Annunciation Catholic School shooting in Minneapolis ...