The newly discovered world is called GJ 251c and it is a super-Earth orbiting a red dwarf star less than 20 light-years away.

No communication or navigation, faulty electronics and collision risk. At ESA's mission control in Darmstadt, teams faced a ...

President Donald Trump’s missile defense system aims to protect the U.S. from nuclear attack, but it may destabilize global ...

CEOs are touting their companies’ ability to rapidly spool up satellite, sensor, and rocket production. Publicly, they all ...