Inside NASA's hunt for exoplanets just like Earth
Looking around at Earth's neighbors, it's fair to say we're on the most livable planet in our solar system. (Lift your game, Mars.) But while Earth seems unique in being able to support life, it's probably not the only planet in the universe with that distinction. There are other planets, known as exoplanets, which are rocky orbs like ours and which orbit their own stars in other solar systems. If those planets exist in the so-called Goldilocks zone -- the orbital distance around their star that makes them not too hot and not too cold...