Planets with retrograde orbits should be rareFrom The BBC:
Astronomers have discovered the first planet that orbits in the opposite direction to the spin of its star.
Planets form out of the same swirling gas cloud that creates a star, so they are expected to orbit in the same direction that the star rotates.
The new planet is thought to have been flung into its "retrograde" orbit by a close encounter with either another planet or with a passing star.
The work has been submitted to the Astrophysical Journal for publication.
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