Why don’t planets collide more often? How do planetary systems — like our solar system or multi-planet systems around other stars — organize themselves? Of all of the possible ways planets could orbit, how many configurations will remain stable over the billions of years of a star’s life cycle?

While three planets have been detected in the Kepler-431 system, little is known about the shapes of their orbits. On the left
are a large…

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Source: archeo