Finally,as Laurence A.Marschall reports in Planetary Prospecting,a clever program to hunt for periodic changes in the spectra of stars has confirmed the existence of numerous giant planets orbiting stars beyond our solar system.

• 最后，正如劳伦斯·玛舍尔在《行星勘探卜》书中所说，一个搜寻恒星光谱周期变化的聪明计划证实在太阳系之外有无数个大行星围绕着恒星在做轨道运行。