itsfullofstars:

Two Planets Discovered Sharing the Same Orbit

In a cosmic first, the Kepler telescope has discovered two planets sharing the same orbit. There is a theory that says our moon was created when a body sharing our orbit crashed into Earth, but up until now no one had found evidence of co-orbiting planets elsewhere in the universe.

It is possible that such a phenomenon could occur when matter around a newborn star forms into planets. In a planet’s orbit around a star, there are two places where a third body can safely orbit. These spots, known as Lagrange points, are 120 degrees in front of and behind whichever body is smaller. The discovered co-orbiting planets, located in the four-planet system KOI-730, are always 120 degrees apart, permanent fixtures in each others’ night skies.

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