What is life? In this interview, Gerald Joyce of the Scripps Research Institute reveals why it’s been so hard for scientists to come up with a definition that encompasses the multiple dimensions of life as we know it.
The Search for Extraterrestrial Intelligence can be said to have begun in 1896, but it has evolved over the years. SETI's Laurance Doyle tells SPACE.com what the 21st-century search for E.T. is like.