this post was submitted on 24 Aug 2024
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๐Ÿ‘๏ธ ๐ŸŒน ๐Ÿ’จ ๐Ÿ’จ (lemmy.ml)
submitted 3 weeks ago by [email protected] to c/[email protected]
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cross-posted from: https://lemmy.ml/post/19504984

It's all relative

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[โ€“] [email protected] 2 points 3 weeks ago

While it is true that space time dilation can cause red/blueshift, that is a distinct from the doppler effect which is the primary effect here.

(dilation plays only a small role: without time dilation our answer going from 700nm to 350nm would be 0.5c instead of the 0.6c calculated below)