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Kepler-10c

If you like it hot, you might want to check out Kepler-10c. This scorching-hot exoplanet blazed its way to being officially acknowledged by scientists in 2011. It's a little more than two times the size of Earth and orbits its host star every 45 days [source: NASA]. Kepler-10c was first spotted by the Kepler space telescope some 560 light-years away from Earth. But what makes this distant sphere unique is how researchers confirmed its existence.

Scientists wanted to make sure the finding was a planet and not something else. By using a combination of tools, astronomers did just that. The space agency's Spitzer Space Telescope, in tandem with a new software called "Blender," provided the evidence needed to grant Kepler-10c planet status. The technique "blends" light from other sources around the potential planet and tracks them over time to ensure there's no mistake. In fact, the method allows scientists to be more than 99 percent sure that they're observing a planet and not some other celestial body.

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