If any intelligent aliens share our cosmic neighborhood, we may be able to get their attention using a powerful laser beacon. A 1- or 2-megawatt laser beamed through a 100- to 150-foot-wide (30 to 45 ...

Whether there's life beyond Earth is one of the most profound questions we can ask, and finding out is a cornerstone of many a space mission. But if there is anybody out there, they might also be ...