It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
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Amay be caused by the interaction where two stars orbit each other
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Bmay be caused by the interaction between two stars that each orbit the other
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Care because of the interaction between two stars that orbit each other
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Dare caused by the interaction of two stars where each is orbiting the other
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Eare caused by the interaction of two stars orbiting each other
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