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this post was submitted on 08 Jul 2026
1005 points (99.5% liked)
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I… how fast would it need to be going for a red rose to look blue.
assuming we want the frequency to double,
going by this formula: https://en.wikipedia.org/wiki/Redshift
with the wavelength ratio 1 + z we want 1 + z = 1/2 so v = -3/5 c = -0.6c if i calculated correctly (i did this in my head without a napkin), where the source moves away from the observer with velocity v. so it would have to move towards you quite rapidly.
0.6 *300 000 km/s =180 000 km/s
How many freedom units is that?
Greater than the cumulative speed achieved by 20,000 horses fed with 3 canisters of barley.