Describe the key components that power a quasar and where they are situated.
At a distance of 6.20×108 light-years6.20 \times 10^8\text{ light-years}6.20×108 light-years, a certain quasar has a measured redshift z=0.0440z = 0.0440z=0.0440. Use these data to estimate the age of the Universe in seconds. (Take 1 light-year=9.46×1015 m1\text{ light-year} = 9.46 \times 10^{15}\text{ m}1 light-year=9.46×1015 m and the speed of light c=3.00×108 m s−1c = 3.00 \times 10^8\text{ m s}^{-1}c=3.00×108 m s−1.)
A typical quasar is believed to have a power output approximately 160016001600 times that of a typical galaxy. Estimate, with reference to the inverse-square law, how much further the most distant visible quasar is likely to be compared to the most distant visible galaxy, assuming they must have the same minimum detectable brightness.
