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Could they be pink because of redshift?

pink redshift
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Could they be pink because of redshift?

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The light from very distant objects is stretched when it reaches us, due to the expansion of space. We have measured this “redshift” for the pink black holes, and allowed for it in our calculations. It is not the explanation of their colours: they would look pink regardless of their redshift. A varient on this explanation used the Doppler effect: light emitted from stuff moving towards us will appear to have a shorter wavelength, and light moving away from us will have a longer wavelength. We see this effect in the emission from gas around these pink black holes, but it is far too small an effect to account for the pinkness. Thus the swirling motions of gas around or into the black holes cannot produc the colour. Yet another varient is gravitational redshift: light escaping from close to a black hole has a lot of gravity to fight, which can exhaust it and make it’s wavelength increase. This is seen in X-ray emission from some black holes, but is a negligible effect at the wavelengths w

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