What non-gravitational force is caused by the ice in comets turning instantly to gas when near the Sun?

Answer

Sublimation, which carries momentum away and exerts a recoil force.

When ice sublimates (turns directly to gas), the escaping gas carries momentum away from the comet, resulting in a net recoil force that can nudge the comet off its predicted path.

What non-gravitational force is caused by the ice in comets turning instantly to gas when near the Sun?

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