1. The quasar known as LPIF13 has a redshift of z = 2.58 and a
flux at Earth's surface of 5 * 10^(-15) Watts per square meter.

(a) When measuring the spectrum of this quasar, where do the
hydrogen-alpha and hydrogen-beta emission lines appear?  Their
rest wavelengths are 656.3 nm and 486.1 nm respectively.

(b) How fast is LPIF13 moving away from 
Earth due to the expansion of the universe?

(c) If a cloud of high-density, low-energy hydrogen gas lies
directly between Earth and LPIF13 at a redshift of z = 1.5,
what features would we see in the observed spectrum of LPIF13 that 
would indicate the existence of this gas cloud, and where would we
see them?  Explain your reasoning.