Answer:
The quasar is moving with 0.93 the speed of light.
Explanation:
Let:
v be the speed that the quasar is moving at away from us,
z be the redshift
c be the speed of light.
The relativistic doppler shift formula, the fraction of the speed of light that the quasar is moving away from us is given by:
v/c = [(z - 1)^2 -1]/[(z - 1)^2 + 1]
= [(6.1 - 1)^2 -1]/[(6.1 - 1)^2 + 1]
= 0.93
v = 0.93×c
Therefore, the quasar is moving with 0.93 the speed of light.
