How do radio waves work in space?

To be quite honest, the same way they work on earth. Radio waves are just electromagnetic radiation. Unlike sound waves, which require material to vibrate and reflect energy to be heard, radio waves are received by being caught by an antenna, and then focussed and amplified using a tuner and amplifier system. read more

Radio antennas can detect radio waves, and are programmed to make noise based on what signals they get. So, sending radio waves through space is more like Morse code with lasers than yelling into a megaphone. read more