The Kepler space telescope is a telescope that has been orbiting the Sun since 2009 and its whole job is to look for what are known as exoplanets—planets orbiting stars other than our Sun.
The biggest goal of the Kepler Mission is to find what astronomers called Earth-like planets, around the size of the Earth and in what's known as Goldilocks Zone, a place where it's not too hot, not too cold—just right for water to exist in liquid form.
Water of course is the essential ingredient for life as we know it.
What we just discovered were two planets that are orbiting their sun in the Goldilocks zone.
The known exoplanets most similar to Earth may be Kepler-438b and Kepler-442b.
Almost certainly warm enough but not too warm not too cold for water to exist in liquid form.
These all planets are so close to the size or this suggests they could be rocky worlds like Earth as opposed to giant gas balls like Neptune and Jupiter, that's significant because that's in easier place for life to take home.
Missions like Kepler important because humanity is a little bit like fish in an aquarium, might be the most magnificent most richly equipped aquarium. However, we're on one side of the glass and we're looking across the living room, out of the window, down the block, we want to get there—a new world.