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It depends on your frame of reference.

The earth travels around the sun.

The sun travels around the centre of the Milky Way Galaxy and takes the earth along with it. So the earth travels at the combined speed of those two motions.

But then, the Milky Way Galaxy rotates around the centre of our local cluster and takes the Sun and the earth along with it. So the earth travels at the combined speed of those three motions

Our local galactic cluster is not static, so ...

And so on.

Where do you stop and say this is the fixed point of reference against which I will measure the speed of the earth?

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13y ago

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