The table below contains observational data for two galaxies.
| Galaxy | Redshift, zzz | Distance from Earth / ly\text{ly}ly |
|---|---|---|
| UGC 1234 | 5.6×10−35.6 \times 10^{-3}5.6×10−3 | 7.5×1077.5 \times 10^77.5×107 |
| UGC 5678 | 2.4×10−32.4 \times 10^{-3}2.4×10−3 | 3.6×1073.6 \times 10^73.6×107 |
Discuss whether these data are consistent with Hubble’s Law.
Quasars are some of the most distant observable objects in the universe. Discuss one difficulty in using standard candles (such as Type Ia supernovae) to determine the distance from the Earth to a very distant quasar.
