It’s kind of a big deal. Here’s why.
Astronomers have discovered the first Earth-sized planet in the "habitable zone," or the distance from a star that a water can pool on the planet's surface.
While other Earth-like planets have been found, they've all been bigger than Earth, making understanding what they're made of a bit more challenging to understand.
Nasa Nasa / Reuters / Reuters
The new planet, Kepler-186f, resides about 500 light-years away from us in the constellation Cygnus (pictured below).
What scientists know: Its year is 130 days and that it gets one-third the heat energy that we do from our sun.
What scientists don't know (yet): Kepler-186f is likely to be very rocky, but researchers can't confirm its mass, density, or composition.
Wait, rewind. What is Kepler?
NASA / Via youtube.com
And what's an exoplanet?
It's a planet that orbits a star outside our solar system.
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