The extension of astronomy from visible light to radio waves to x-rays and gammarays never failed to lead to the discovery of unusual objects such as radio galaxies, quasars, and pulsars.
从可见光扩展到无线电波，再到 X 射线和伽马射线，天文学总是会发现不寻常的物体，如射电星系、类星体和脉冲星。
2
But how can terrestrial gammarays reach Fermi's orbit in space?
但地表伽马射线如何能到达太空中安放费米镜的卫星呢？
3
When these electrons are deflected by molecules in the atmosphere, they emit gammarays.