射电波实际是无线电波的一部分。地球大气层吸收了来自宇宙的大部分电磁波，只有可见光和部分无线电波可以穿透大气层。天文学把这部分无线电波称为射电波。至于为什么这么叫应该是为了与通信用的无线电波区分。
但有些恒星，所谓的脉冲星，会有规律地发出射电波脉冲。
But certain stars, called pulsars, give off regular pulses of radio waves.
绑匪通过发射电波信号同科学家联络。科学家保持电波发射联络。
The kidnappers contacted the scientist by emitting the radio signals the scientist kept in touch with the emission.
具有讽刺意义的是，产生射电波束的详细原因在天文上，这也许并不重要。
Ironically, the detailed reasons as to how the radio beam is produced may not be important astronomically.
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