An Advanced Civilization Lives on a Planet Orbiting a Close

question 102

Multiple Choice

An advanced civilization lives on a planet orbiting a close binary star system that consists of a 15MSᵤn red giant and a 10MSᵤn black hole.Assume that the two stars are quite close together,so that an accretion disk surrounds the black hole.The planet on which the civilization lives orbits the binary star at a distance of 10 AU.
-Sometime within the next million years or so,their planet is likely to be doomed because

• A)jets of material shot out of the accretion disk will shoot down their planet.
• B)their planet receives most of its energy from the red giant.However,this star will soon be completely devoured in the accretion disk and thus will no longer exist.
• C)the red giant will probably undergo a supernova explosion within the next million years.
• D)tidal forces from the black hole will rip the planet apart.
• E)the planet's orbit gradually will decay as it is sucked in by the black hole.

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