Are we alone in the Universe? With more than 100 billion galaxies in the observable universe and at least 500 billion planets ...

We have only one example of biology forming in the universe—life on Earth. But what if life can form in other ways? How do you look for alien life when you don't know what alien life might look like?

Look up at the night sky long enough and you start wondering whether alien life exists somewhere out there. But here’s the twist: you don’t need to leave Earth to find something genuinely otherworldly ...