Kepler-22b
The planets that make astronomers the most excited are ones that look a lot like Earth, because they could hold some form of alien life. Kepler-22b is one such planet. It’s in the so-called “Goldilocks Zone,” which means that it’s not too hot and not too cold to sustain life. It’s also covered in water, making it a prime location for finding E.T. at some point in the future.