Humanity has thought about colonizing other planets since the dawn of astronomy. We’ve written books, and made movies about it. But now it seems we’re closer than ever to make this idea a reality. Scientists have considered a lot of candidates for Earth 2.0, and they've found some! What would it be like to live among Venus' clouds, or reside inside Mercury's underground lava tubes? What planet is going to be the first one to have human colonies? And how different will our lives become once we le