Question

Why do some quasars have red shifts greater than 1?

A) They are made of tachyons and thus are able to move away from us faster than the speed of light.

B) They are made of different elements than any other objects in the universe.

C) They are moving towards us, which throws off our spectrometers.

D) Einstein proved it is impossible to have a redshift greater than 1; these are all due to gravitational lensing tricking us

Answer 1

D) Einstein proved it is impossible to have a redshift greater than 1; these are all due to gravitational lensing tricking us

Step-by-step explanation:

By Einstein's theory of relativity the maximum value of the red shift is 1. This correspond to a case in which the observed frequency equals the emitted frequency:

`z=(f_e-f_o)/(f_o)`

in other cases the red shift is lower than one.

Hence, the gravitational lens change the measurements of the observed frequency and because of that we calculate a greater red shift.

Hence, the answer is:

D) Einstein proved it is impossible to have a redshift greater than 1; these are all due to gravitational lensing tricking us

hope this helps!!