The Science: Europa has been considered as a top contender for alien life for even longer than Enceladus, thanks to its massive under-ice liquid water oceans. It also displays water vapor plumes ...

Who hasn't looked into the sky and wondered if there's life out there, somewhere, looking back at us? Is it possible there's alien life closer to home — within the bounds of our solar system? The ...

Long before the hunt began to find Earth lookalikes around other stars, one planet in the solar system had already been named Earth's twin. With its similar size and mass, Venus measures very close to ...