Quasars, the expanding Universe and large-scale structure
Answers are for parents and teachers.
1
d = 50 Mpc, H₀ = 70: v = ?
3500
2
v = 14,000 km/s: d = 14,000 : 70 = ? Mpc
200
3
z = 0.01: v = 300,000 · 0.01 = ? km/s
3000
4
Why does Hubble’s law not mean that the Earth is at the centre of the Universe?
An observer in any galaxy sees all others receding – it is the expansion of space.
5
Why do we say that distant quasars show the “young Universe”?
Their light has travelled for billions of years; we see them as they were then.