Though humans have long looked to the stars, the history of human interest in alien life is relatively recent. Here's a look back at how humans have throughout ... source

What is a habitable exoplanet? How many are there? And where are all the aliens? Exoplanets can serve as a test for the universal laws of biology. Could life ... source

Dr. Vakoch is President of Messaging Extraterrestrial Intelligence (METI). As astronomers launch ambitious projects for Messaging Extraterrestrial Intelligence, ... source