In 1991, scientists bounced radio waves off Mercury, and found an unusual bright return from the north pole. The apparent brightening at the north pole could be explained by ice on, or just under the surface. But is it possible for Mercury to have ice? Yes. Because Mercury’s rotation is almost perpendicular to its orbital plain, the northern pole always sees the Sun just above the horizon.

The inside of craters would never be exposed to the Sun, and would remain very cold. This freezing temperature could trap water out- gassed from the planet from impacts with comets. These ice might be covered with a layer of dust, and would show bright radar returns.

Posted by :- Dr. Prashant

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