Looking for Aliens: Are they there? Are they here? | Seth Shostak
March 18, 2020


In one of astronomy’s greatest modern triumphs, we now know that there are a trillion planets in the Milky Way. Roughly one in five may be similar to Earth. So with so much cosmic real estate, there must be someone out there, right? Science agrees, and may soon augment opinion with discovery. But what about …