What wouls be the value of gravity on the surface of the earth if its mass was twice as large and its radius half of what it is now?
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Gravity on such a planet's surface would be approximately 2.2 times as strong as on Earth. If it is an icy or watery planet, its radius might be as large as twice the Earth's, in which case its surface gravity might be no more than 1.25 times as strong as the Earth's.
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