Which physical law allows astronomers to probe the Universe's past?
A) gravitational lensing
B) the Doppler effect
C) the finite speed of light
D) the inverse square law

Question

Quizplus · Accepted Answer

The finite speed of light allows astronomers to probe the Universe's past. This is because it takes time for light from distant objects to reach us, so we can see them as they were in the past. By looking at objects that are further away, we can observe events that happened billions of years ago.

Which Physical Law Allows Astronomers to Probe the Universe's Past