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Artist’s impression of an exoplanet WASP 8b in a retrograde orbit

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Up to now it was expected that exoplanets would all orbit in more or less the same plane, and that they would move along their orbits in the same direction as the star’s rotation — as they do in our Solar System. However, new results unexpectedly show that many exoplanets actually orbit at a large angle to their star’s spin axis. In the case shown here (WASP 8b) the orbit is completely reversed, or retrograde. The star spins in one direction (towards the right as seen here) and the planet orbits the opposite way (towards the left). The speed of motion is greatly increased in this animation.

Credit:

ESO/L. Calçada

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About the Video

Id:eso1016a
Release date:13 April 2010, 12:00
Related releases:eso1016
Duration:26s

About the Object

Type:• Milky Way : Star : Circumstellar Material : Planetary System
• X - Stars
• X - Illustrations

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