What is a Roche lobe?
A) an imaginary boundary around each star in a close binary system encompassing the mass gravitationally bound to that star
B) an imaginary boundary around each star in a close binary system that marks the limit outside which planets cannot form
C) an imaginary boundary around each star in a close binary system that marks the limit inside which planets cannot form because they would be torn apart by the star's gravity
D) an imaginary boundary around each star in a close binary system that marks the limit of each star's gravitational pull and within which the stars will have no effect on each other
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