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shadow29warrior t1_j27hx2k wrote

I'll like to add one more question, if everything is space is moving relative to each other ie the sun, moon, milky way, other galaxies.... then how do you find the absolute speed at which the earth moves forward in space?

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IhoujinDesu t1_j27qqw7 wrote

Relative to the CMB. The cosmic background radiation as a distant and very uniform reference frame can tell us about our motion through space due to doppler shift. It will vary throughout the year as we swing around in our orbit. And there is a consistant bias due to the sun's orbit around the milky way and the overall motion of the galaxy.

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rants_unnecessarily t1_j27k043 wrote

Exactly.
Everything is relative when it comes to velocity.

If you compared to the Earth our velocity is 0. And everything else is moving very very fast.

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Xyex t1_j2878zt wrote

>then how do you find the absolute speed at which the earth moves forward in space?

You don't. You can't. Because there's no such thing. All speed is relative.

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vpsj t1_j28xxt0 wrote

There is no such thing. Speed is always measured by assuming something is stationary

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[deleted] t1_j284tbt wrote

[removed]

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muskytortoise t1_j29ghl9 wrote

Did you not read the question before answering or did you just feel like being obtuse?

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