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6) Using Hubble’s law, estimate the wavelength of the 590 nm sodium line emitted from galaxies (a) 2*10^6 lightyears away from Earth, (b) 2*10^8 lightyears away, and (c) 2*10^9 lightyears away.
** Use the relativistic Doppler formula for light emitted from a receding source)
** Use the relativistic Doppler formula for light emitted from a receding source)