Question

How does looking at distant galaxies allow us to look back in time ?

I don't need copied answer ❌​

Answer 1

Answer:

Strictly speaking, when telescopes look at the light from distant galaxies, they are not literally looking back in time. ... This means that the light emitted by this galaxy traveled for 140 million years before reaching us on earth, and therefore this image shows what the galaxy looked like 140 million years ago.