地外行星 meaning in Chinese

superior planets

For example , if there is a planet orbiting around the neutron star , it will wobble a little and the pulses will come a little early or late . we can then deduce the mass and the radius of the orbit of the planet from the arrival time of the pulses . this is how the first extrasolar planet is discovered
例如假若有一颗行星围绕一颗中子星运行，它会令中子星出现摇动，引致脉冲的间隔变长或短，由此我们根据脉冲周期的变化，可推断出行星的质量和轨道半径，这亦是天文学家找出第一颗地外行星时所用的方法。