Are we in the next step of human evolution with space travel?

Around 500 million years ago, animals first ventured out of the oceans and onto land…Since then, life has evolved in wondrous and unforeseeable ways to this new environment, with everything from dinosaurs to bats roaming around above the waves. And, in the case of ourselves, even venturing into orbit.So, could life entering the cosmos be the beginning of a similar evolutionary leap?Caleb Sharf, Astrobiologist with NASA and author of ‘The Giant Leap: Why Space Is the Next Frontier in the Evolution of Life’, joins Seán to discuss.