[填空题]
Estimate the speed of a galaxy, andh vl1yko-9i -6 vmbfi, its dista* 6t i0+st2htazxj sy2nce from us, if the wavelength for the hydrogen line at 434 nm is measured on Earth as being 610 nm. *6 x2t0th2aj+z tsyi s Eqs.33-4 and 33-5a v $\approx$ c
Eq.33-6 v $\approx $ $ \times 10^9\ \text{y}$
