Origin And Maintenance Of A Retrograde Exoplanet

Astronomers have shown that the HAT-P-7 planetary system, which is about 1040 light-years from Earth in the constellation Cygnus, includes at least two giant planets and one companion star. The discovery of a previously unknown companion (HAT-P-7B) to the central star (HAT-P-7) as well as confirmation of another giant planet (HAT-P-7c) orbiting outside of the retrograde planet HAT-P-7b, offer new insights into how retrograde planets may form and endure.

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