Imagine an Advanced Civilization Living on a Planet Orbiting at a Distance

question 89

Multiple Choice

Imagine an advanced civilization living on a planet orbiting at a distance of 10 AU (1.5 billion kilometers) from a close binary star system that consists of a 15 MSᵤn red giant star and a 10 MSᵤn black hole.The black hole is surrounded by an accretion disk.Sometime within the next million years or so,the civilization's planet is likely to be doomed because

• A)the red giant will probably supernova within the next million years.
• B)jets of material shot out of the accretion disk will shoot down their planet.
• C)the red giant star,which provides most of energy the civilization needs to exist,will soon be destroyed in the accretion disk.
• D)tidal forces from the black hole will rip the planet apart.

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