But radio waves, which have wavelengths ranging from 100 microns to 100 kilometers, are much lower energy and can’t excite your eyes, so they are invisible to us.

然而，无线电波波长可介于一百微米到一百公里，能量较低，无法激起感光细胞作用，所以为不可见光。

But radio waves, which have wavelengths ranging from 100 microns to 100 kilometers, are much lower energy and can't excite your eyes, so they are invisible to us.

然而，无线电波波长介于一百微米到一百公里之间，能量较低，无法激起感光细胞作用，所以为不可见光。

Star forming gas clouds emit a very narrow wavelength range of radio waves, and this could be used to measure their Doppler shift, how quickly they were moving toward or away from us.

恒星形成气体云发射出波长范围非常窄的无线电波，这可以用来测量它们的多普勒频移，即它们向我们移动或远离我们的速度。