Radiowaves exist in nature, from sound and light to cosmic rays in space.
无线电波广泛存在于自然界中,从声波、光波到空间中的宇宙射线。
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And Wilson and Penzias discovered the cosmic microwave background radiation, physical evidence for the Big Bang, while fiddling with an antenna designed to catch radiowaves bouncing off satellites.
As another example, cosmic rays have a wavelength of lessthan a millionth of a millionth of an inch, while some radiowaves have wave lengths of over a mile!