For decades, a dedicated international band of researchers has searched the skies in the hopes of finding some sign that humanity is not alone in the universe. They’re engaged in SETI, the Search 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.