Question

5 astronomers often scan the sky using devices called radio telescopes. what can you conclude about these devices? a they send radio broadcasts out to distant stars and planets b they pick up the radio waves emitted by stars. c they are less powerful than optical telescopes. d they can detect ultraviolet radiation.

Explanation:

Radio telescopes are used to detect radio - waves emitted by celestial objects like stars, not to send broadcasts to them. They are not less powerful than optical telescopes in all aspects and they do not detect ultraviolet radiation as their primary function.

Answer:

B. They pick up the radio waves emitted by stars.