The table below displays observational data for two nearby spiral galaxies.
| Galaxy | Redshift, zzz | Distance from Earth / Mpc\text{Mpc}Mpc |
|---|---|---|
| NGC 4321 | 3.4×10−33.4 \times 10^{-3}3.4×10−3 | 14.814.814.8 |
| NGC 4414 | 7.1×10−37.1 \times 10^{-3}7.1×10−3 | 31.531.531.5 |
Evaluate whether these observational measurements are consistent with Hubble’s Law.
Quasars are extremely distant active galactic nuclei. Discuss one difficulty in using standard candles, such as Type Ia supernovae, to determine the distance from Earth to a very distant host galaxy of a quasar.