Having your personal satellite launched into orbit might sound like an idea straight out of science fiction.(把你的个人卫星发射到轨道上，可能听起来像是科幻小说里的情节。)
Once, we saw it was moving in a pattern consistent with an orbit.(有一次，我们看到它以与轨道一致的方式移动。)
Within each orbit, collisions between planetesimals generated immense heat and energy.(在每个轨道内，天体之间的碰撞产生了巨大的热量和能量。)
These data have established a strong connection between variations in the Earth's orbit and the periodicity of the ice ages.(这些数据已经建立了地球轨道变化和冰期周期之间的强有力的联系。)
Its orbit brought it relatively close to the Earth, within 122 million miles of it.(它的轨道使它相对接近地球，距离在1.22亿英里以内。)
However, as the cost of getting your own satellite in orbit drops sharply, the risks of irresponsible use grow.(然而，随着将自己的卫星送入轨道的成本大幅下降，不负责任使用卫星的风险也在增加。)
What we need is a really tall tower here on the ground right at the equator and a satellite in geostationary orbit.(我们需要的是一个在赤道处地面上的非常高的塔，以及沿地球静止轨道绕地运转的卫星。)
With nine engines on the first stage, Falcon 9 can reach orbit even if one or more fails.(猎鹰9号的第一级有9个引擎，即使一个或多个引擎故障，它仍然可以到达预定轨道。)
The earth's gravity slows the moon's rotation, matching it to the speed of its orbit.(地球引力减缓了月球的自转速度，使之与其轨道的速度相匹配。)
The orientation of the planet's orbit is changing continuously.(该行星轨道的方向不断变化。)
