Also that velocity, v, in that equation number five will also change with time because it's an elliptical orbit.
同样的，第五个方程序，中的速度同样，会随时间改变，因为这是椭圆形轨道。
2
The Earth's orbit is getting crowded. The past few years have witnessed huge growth in the number of satellites.
过去数年，随着卫星数量的剧增，地球轨道日趋拥挤。
3
Solar power satellites that have been manufactured on the moon will have been placed in orbit around a number of planets and moons, providing nearby planetary outposts with continuous electric power.