NASA makes a surprising discovery: a new planet, a so-called "Mega-Earth."
The planet is known as Kepler-10c.
It has a mass 17 times that of Earth, partly since the surface and mass is made of rock, as opposed to gas.
The planet is believed to be about 11 billion years old.
Don't get too excited though, Kepler-10c isn't likely to sustain life since it's too close to its parent star, 560 light-years away.
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