What is the search for Earth-like planets telling us about our place in the cosmos? Is our Earth one of countless life-bearing worlds strewn about the galaxy, or is it a rare Garden of Eden in a barren universe?
What is the search for Earth-like planets telling us about our place in the cosmos? Is our Earth one of countless life-bearing worlds strewn about the galaxy, or is it a rare Garden of Eden in a barren universe?