Dust Grains Released by the Melting and Sublimation of Ice

question 180

Multiple Choice

Dust grains released by the melting and sublimation of ice in a comet nucleus

• A) drift away from the Sun along magnetic field lines, outlining the structure of the field.
• B) become a straight, highly structured, and very variable tail blown away from the comet by the solar wind.
• C) become a cloud around the nucleus, the coma, scattering sunlight very efficiently at blue wavelengths.
• D) become a uniform, curved tail moving away from the comet under radiation pressure from sunlight.

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