Satellite Radio

摘要

Radio waves from 0.3 to 120 MHz could provide information about the evolution of the universe during the first 500 million years after the big bang. On Earth, however, those cosmic waves are often drowned out by FM radio waves, digital TV signals, and other interference, making astronomy in that range difficult. Even on the surface of the moon, the signal from just one FM radio station on Earth is about 100 million times stronger than cosmic signals of the same wavelength.