Astronomers discover the first known exoplanet to survive a catastrophic collision with another planet. The impact, which occurred about 1,700 light-years away, stripped the planet (Kepler-107c) of its silicate mantle, leaving behind a dense, iron-rich core that's roughly the size of Earth.

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Astronomers discover the first known exoplanet to survive a catastrophic collision with another planet. The impact, which occurred about 1,700 light-years away, stripped the planet (Kepler-107c) of its silicate mantle, leaving behind a dense, iron-rich core that's roughly the size of Earth.