JoshuaInNippon writes: Our sun and the planets that revolve around it all move in the same direction. Since 1995, over 400 planets outside our solar system have been found, and many of them are strikingly different than that of us. To explain these differences, a variety of planetary evolution models have been proposed, including the theoretical possibility that some planets orbit in the opposite direction to that of their star rotation. On November 4th, researchers from the National Astronomical Observatory of Japan (NAOJ) announced they have found such a retrograde orbit planet for the first time, around HAT-P-7, a star about 1,000 light years away.
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