Planetary Size Collision Could Explain Density Anomaly in Kepler-107 System

Image Credit: NASA/JPL-Caltech

Image credit: NASA/JPL-Caltech

Kepler-107, a star over 1,700 light years from Earth, was found in 2014 to have at least four planets orbiting it. One of those planets, Kepler-107c, has an average density that is more than twice that of the Earth’s, which would be anomalously high for a terrestrial planet. One possible mechanism for getting a high density contrast between terrestrial planets would be to have a major impact. This impact would strip the outer layers of the planet away, leaving the denser core as a majority fraction of the leftover body. While this theory potentially explains the density anomaly of the Kepler-107c, it does not explain why the planet is not the closest to the sun, which is typical of the densest planet in a solar system. READ MORE

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