Submitted by JarasM t3_100snke in askscience
cheeseitmeatbags t1_j2lfq64 wrote
Reply to comment by Aseyhe in Is any "movement" visible in the fluctuations of the CMB over time, or does it appear static? by JarasM
Redshift is equivalent to time dilation? So early galaxies at high redshift appear basically frozen in time from our perspective? I've never heard of this... wouldn't nova events (or other time dependant events) in distant galaxies last way longer than close ones, from our perspective?
That-Soup3492 t1_j2loe82 wrote
In fact, they do. It's very useful for us, allowing us to get a lot more data from them.
https://www.newscientist.com/article/dn13792-cosmic-time-warp-revealed-in-slow-motion-supernovae/
cheeseitmeatbags t1_j2lp4u9 wrote
Nice. Just learned another something weird and cool about our universe!
15_Redstones t1_j2nj0as wrote
Redshifting slows down the frequency of light. But the total amount of oscillations of the light signal isn't affected.
Suppose a far away galaxy sends a 1 second long burst at 1 GHz, 1 billion cycles. At Earth it arrives redshifted to twice the wavelength, and a frequency of 0.5 GHz. We still receive 1 billion cycles, they're just spread over 2 seconds of time now. So we effectively see the signal - and everything else from that distant galaxy - at 0.5 speed.
[deleted] t1_j2lj6h6 wrote
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