Close binary star systems are thought to form when
A)two interstellar gas clouds happen to contract so close together that there's no room for a disk or planets.
B)the protostellar disk around a protostar has enough material to form a second star.
C)gravity pulls two neighboring protostars quite close together,but angular momentum causes them to orbit each other rather than colliding.
D)a protostar emits two jets,each of which turns into a star.

Question

Quizplus · Accepted Answer

Close binary star systems form when two neighboring protostars are pulled close together by gravity, but their angular momentum causes them to orbit each other rather than colliding. This process results in a system with two stars orbiting each other, which is a common type of binary star system observed in the universe. Option A is incorrect because close binary systems do have room for a disk and can even have planets. Option B is incorrect because a protostellar disk around a protostar can only form one star. Option D is incorrect because jets from a protostar do not directly result in the formation of binary star systems.

Close Binary Star Systems Are Thought to Form When