- #1

- 107

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I made a (rough) calculation of how far the Moon would be moving away from Earth according to Hubble's law = 72.6 (km/s)/Mpc

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1 megaParsec = 3.08 × 10

^{22}m ≈ 4 × 10

^{22}m

Distance between Moon and Earth ≈ 4 x 10

^{8}m

Expansion rate ≈ 7.2 10

^{4}(m/s)/4 × 10

^{22}m = 7.2 (m/s)/4 × 10

^{18}m

Thus expansion for Earth - Moon ≈ 7.2 x 10

^{-10}m/s

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Is this calculation correct? If so, than that it would be about one picometer per second, or is Earth's gravity force simply keeping the Moon in it place?

Thanks,

m.