Fast-forward to today: we’ve gone from one lonely planet to a catalog of thousands. The pace is accelerating. In 2015, NASA’s ...

Shares of First Solar Inc. dropped about 11% in the extended session Tuesday after the solar-panel maker reported quarterly profit that was wide off the mark and cut its guidance for the year. First ...

For decades, astronomers have wondered whether Earth-like planets are rare gems or commonplace across the stars. Recent ...