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๐๏ธ ๐น ๐จ ๐จ
(lemmy.ml)
cross-posted from: https://lemmy.ml/post/19504984
It's all relative
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this post was submitted on 24 Aug 2024
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OK I need someone to explain this to me cause AFAIK light speed is constant no matter how fast moving the source is
Which is achieved by spacetime dilation which can in turn stretch or compress the light waves.
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)