This is the Earth twin scientists have been searching for over the past 20 years. And it's called Kepler 452b.

Some scientists believe we're most likely to find life outside of Earth if we look beyond our solar system. Life, they think, could be present on a planet like Earth, but there are no such planets in our solar system, so we have to look farther.

Planets beyond our solar system do exist; they're called exoplanets. The first exoplanet was discovered in 1995. But despite identifying thousands of exoplanets over the last 20 years, scientists hadn't found a planet that's similar to Earth because there are a lot of boxes to check, including the type of star it orbits, the distance it is from that star, and the size of the exoplanet.

Now, they have one: Kepler 452b, which will forever be remembered as the first "second Earth," or what NASA refers to as "Earth 2.0," ever discovered: