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In rough rounded figures . . .

-- The moon's diameter is 27.3% the size of the Earth's diameter.

-- That makes the moon's surface area 7.5% the size of Earth's surface area.

-- And it makes the moon's volume 2% the size of the Earth's volume.

-- The moon's mass is 1.23% the size of the Earth's mass.

(When we notice that the moon has 2% of Earth's volume but only 1.23% its mass,

we realize immediately that the moon's average density is only 60% of the Earth's

average density.)

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