THE recent discovery of solar radio noise, in the range 30-1,000 megacycles ... will produce electromagnetic radiations the maximum wave-lengths of which are comparable to stellar dimensions.

At double the width of our Milky Way galaxy, this jet of radio waves is the biggest ever detected so early in the history of the universe, astronomers reported Thursday. Radio jets like this are ...

So, instead of using ultrasound, radio waves are used as they travel at 300,000,000 m/s. It works in the same way as sonar but with radio waves in place of ultrasound. A short pulse of radio waves ...