What if aliens in the universe send a message to Earth, and we can’t understand what they’re saying? Communicating with another species is likely to be tricky, given how difficult it already is for ...

An ambitious new SETI (search for extraterrestrial intelligence) test is underway. At 3 p.m. EDT (1600 GMT) today (May 24), Europe's Trace Gas Orbiter Mars probe beamed a coded message toward Earth.

If intelligent aliens are out there, why aren’t we hearing from them? Are they silently observing us like zoo animals, or staying quiet out of fear that they’d catch the attention of a bloodthirsty ...