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Updated: May 20, 2025
The moon however, having only one-eightieth the mass of the earth, cannot retain any gas, hence its airless and waterless condition. Water Vapour cannot exist on Mars. Now, Dr. Stoney finds that in order to retain water vapour permanently a planet must have a mass at least a quarter that of the earth.
Being only about one-eightieth part of the bulk of the earth, the force of gravity on the moon's surface is only about one-sixth.
Is it not certain that government would be weak and irregular, and that the people would be poor and contemptible? And still it must be allowed, that each town would entirely surrender its boasted independence if they should unite in State government, and would retain only about one-eightieth part of the administration of their own affairs.
The moon rotates on her axis in about the same time, and hence we can only see one side of her. She is 2,160 miles in diameter, but her mass is only one-eightieth that of the earth. A pound weight on the moon would scale six pounds on the earth. Having little or no atmosphere or water, she is apparently a dead world.
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