A Roche Lobe Is an Imaginary Boundary Around Each Star

question 240

Multiple Choice

A Roche lobe is an imaginary boundary around each star in a close binary system

• A) encompassing the mass gravitationally bound to that star.
• B) that marks the limit outside which planets cannot form.
• C) that marks the limit inside which planets cannot form because they would be torn apart by the star's gravity.
• D) that marks the limit of each star's gravitational pull: As long as each star is within its own Roche lobe, the stars will have no effect on each other.

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