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Nova are thought to occur in a system, X, in which a white-dwarf star orbits a red giant star. What is X?

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Nova are thought to occur in a system, X, in which a white-dwarf star orbits a red giant star. What is X?

(a) Triple System

(b) Binary system

(c) Compact system

(d) Congenial system
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The correct answer is (b) Binary system

The explanation is: A binary system is the one where two stars orbit around a common center of mass. When a white-dwarf star orbits a red-giant star, novae are formed.
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