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How long is 0.0000000990 kilometers?

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It's about 0.0000000000003 times as long as The Distance from Earth to the Moon.
In other words, 0.0000000990 kilometers is 0.00000000000025751980 times the length of The Distance from Earth to the Moon, and the length of The Distance from Earth to the Moon is 3,883,197,000,000 times that amount.
(a.k.a. Luna) (median of semi-major axis, or apigee, and semi-minor axes, or perigee)
The orbit of the Moon around the Earth is elliptical, with an average distance of 384,436.5 km from center-to-center. About 428.376 kg of moon rock have been cataloged on the Earth, from the American Apollo and Soviet Luna Programs, and from samples that have been extracted from meteorites.