Wednesday, October 16, 2013

If the Universe in Expanding, Why isn't the Moon Receding from Earth?

Question: If the universe is expanding then why the moon is at the same distance since we know about it? Shouldn't the moon be further away a little bit more each day?
Asked by: Emmanuel Perez

Answer: Firstly, I’m going to nitpick your question a bit and say the moon is, in fact, moving away from Earth – but not because of the expansion of spacetime. It’s all thanks to orbital mechanics, specifically tidal forces.

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