[填空题]
Estimate the speed of a galaxy, and its distaxgw.p3 ,5azft uue8h7,n,jcince from ux 4 d5,,xngdh6f-dn2hpm-o l/e, u iiijwyk ,1s, if the wavelength for the hyo4ghd6k-2,jpmi,iew5 d-xn,,lihxyu n / df1drogen line at 434 nm is measured on Earth as being 610 nm.
Eqs.33-4 and 33-5a v $\approx$ c
Eq.33-6 v $\approx $ $ \times 10^9\ \text{y}$
