But the example being replied to was going from 10 million years to 1 month, that’s γ = 1.2e8, so β ≈ 1 - (3.4e-17), so blueshift factor ≈ 2.4e8.
I think that means the wavelength goes from 2.7 K ≈ 1.07mm to 4.46pm. Is a blackbody spectrum still a blackbody under Lorentz transform? If so, 650 million K?
I think that means the wavelength goes from 2.7 K ≈ 1.07mm to 4.46pm. Is a blackbody spectrum still a blackbody under Lorentz transform? If so, 650 million K?