Question

What happens to photons as they travel across the universe?

A) They slow down
B) They speed up
C) They maintain a constant speed
D) They change direction randomly

Answer 1

Photons maintain a constant speed as they travel across the universe.

Step-by-step explanation:

The answer to the question is C) They maintain a constant speed. Photons, which are particles of light, always travel at the speed of light in a vacuum, which is approximately 299,792 kilometers per second. This speed is constant and does not change as photons travel across the universe.