Distant galaxies we can see today with a redshift of z ≈ 6 emitted their light when the universe was:
A)five times smaller than it is today
B)six times smaller than it is today
C)seven times smaller than it is today
D)eight times smaller than it is today
E)the same size as it is today

Question

Quizplus · Accepted Answer

The redshift of a galaxy is a measure of how much its light has been stretched by the expansion of the universe. The higher the redshift, the further away the galaxy is and the earlier in the universe its light was emitted. A redshift of z ≈ 6 means that the light from the galaxy was emitted when the universe was about 1/7 of its current size.

Distant Galaxies We Can See Today with a Redshift of Z