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The moon is as small asAustralia because the moon was formed when an object the size of mars smashed into the still molten baby earth (about 3.5 billion years ago). It knocked off a chunk of earth roughly the size of Australia. The chunk of molten earth was sucked into our gravitational field. Due to the theory of relativity and the size of the chunk it developed its own gravity thus making it spherical and the size of Australia.

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15y ago

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