All electromagnetic waves travel at the speed of light (300,000,000 m/s). However, even at this speed, if a radio transmission is
sent to astronauts on the Moon, there is a delay between the time that the message was sent and he time that the astronauts
receive it. Why?
A. The Moon is very far away from the Earth and it takes time for radio messages to travel.
B.
Radio waves are delayed as they pass through Earth's atmosphere.
C.
Radio waves travel at a slower speed through a vacuum than they do through air.
D. Asteroids and other space debris interfere with radio transmissions from Earth.
