If we could see the last few seconds of the collapse of a star to form a black hole,we would see the star grow steadily redder.Why?

Question

Quizplus · Accepted Answer

As a star collapses into a black hole, its gravitational field becomes increasingly intense. This intense gravitational field causes the light escaping from the star to lose energy, which is observed as a redshift. This phenomenon, known as gravitational redshift, is why we would see the star grow steadily redder.

If We Could See the Last Few Seconds of the Collapse