Tracing the signal revealed a surprising source: NASA's Relay 2, launched in 1964 for experimental communications and officially deactivated by 1967, after which its electronics had remained silent ...

Scientists received a mysterious radio pulse that came from a satellite that had been dead for decades. The signal was so powerful that for a moment it outshone all other objects in the sky, New ...

In the 1960s, NASA launched two spacecraft into elliptical medium Earth orbit, hoping they would demonstrate the satellite-based communications technology that had yet to transform the world. The ...