As with ordinary light, laser range measurements to satellites are not troubled by ionospheric refraction . 用激光测人造卫星的距离和用普通光一样，不受电离层折射的干扰。
The formation of the satellite systems of the giant planets parallels in many respects the formation of the planets . 大行星的卫星系统的形成在许多方面相似于行星的形成。
This is found by observing the doppler shift in the frequency of the radio signals broadcast from the satellite . 这是通过观测卫星所发射的无线电信号频率中多普勒偏移来确定的。
In comparison with the classical lunar theory the motion of an earth satellite offers important practical differences . 与经典的月球理论相比较，地球卫星的运动有显著的实际差别。
Comment on the relation between this period and the period of a satellite revolving close to the surface of the earth . 解释这个周期和卫星沿接近地球表面的轨道旋转的周期之间的关系。
It was three years after the first satellite launching that a spaceship containing a man made a successful flight . 第一颗人造卫星发射三年之后，载有一人的宇宙飞船才进行了成功的航行。
Another test, involving the precession of a gyroscope in a satellite circling the earth, is scheduled for the 1970s . 七十年代还安排了另一实验，它包括绕地球旋转的卫星中的陀螺进动性试验。
If a satellite can one day be put into orbit round mars , scientists will be able to find out a great deal . 如果有一天，人造卫星能被发射到围绕火星的轨道上去，科学家们将会发现很多情况。
Satellites orbiting round the earth have provided scientists with a vast amount of information about conditions in outer space . 环绕地球运行的人造卫星，为科学家提供了有关外层空间的大量资料。
Satellites orbiting round the earth have provided scientists with a vast amount of information about conditions in outer space . 环绕地球运行的人造卫星为科学家们提供了大量有关外层空间情况的资料。
