A Particle of Interplanetary Dust Is Close to the Sun

question 61

Multiple Choice

A particle of interplanetary dust is close to the Sun and interacts with the Sun's gravitational field as well as with the light emitted by the Sun. If it only interacts appreciably with the Sun, can it be pushed away from the Sun instead of being pulled towards it?

• A) No, the gravitational force will always dominate if the object is large enough.
• B) No, the gravitational force will always dominate if the object is close enough.
• C) Yes, if the object is small enough, radiation pressure will win over.
• D) Yes, but the object must be very large so that it can gain enough radiation pressure.
• E) None of the previous answers is correct.

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