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1·Mars and Earth have orbits which change with time.

火星和地球的轨道随着时间而发生改变。《柯林斯英汉双解大词典》

2·In molecular orbital theory, we named orbits based on their symmetry.

在分子轨道理论中，我们基于轨道的对称性给它们命名。

3·Most known extrasolar planets reside in highly elongated, not circular, orbits.

大多数已知的太阳系外行星都居住在高度拉长而非圆形的轨道上。

4·They will likely then travel close enough to neighboring planets to disturb their orbits also.

然后，它们很可能会飞得离邻近的行星足够近，从而扰乱它们的轨道。

5·Let's continue our discussion now by talking about orbits, especially those of the so-called periodic-orbit comets.

现在我们继续讨论，谈谈轨道，特别是那些所谓的周期轨道彗星。

6·Astronomers suspect that pairs of planets also engage in this slingshot activity, leaving them in disturbed, elliptical orbits.

天文学家怀疑成对的行星也参与了这种弹弓活动，使它们处于不规则的椭圆轨道上。

7·In any given year, about a dozen known comets come close to the sun in their orbits, the average person can't see them all, of course.

在任何一年中，大约有十几颗已知的彗星在其轨道中接近太阳。当然，一般人看不到所有的彗星。

8·The orbits of Mercury, Venus, Earth, Mars, Jupiter and Saturn fit neatly into this pattern; Uranus, discovered in 1781, also obeyed the law.

水星、金星、地球、火星、木星和土星的轨道恰好符合这种模式；1781年发现的天王星也同样符合该定律。

9·Comets formed in circular orbits but were gravitationally flung into their present-day elliptical orbits when they ventured too close to planets.

彗星在圆形轨道上形成，但当它们冒险太接近行星时，就会被引力抛入现在的椭圆轨道。

10·They can attain more distant orbits; NASA plans for most of its future earth escaping payloads (to the moon and Mars especially) to carry CubeSats.

它们可以到达更远的轨道；美国国家航空航天局计划在其未来的大部分发射任务（尤其是去月球和火星的）中携带立方体卫星。

(1)in orbit在轨道上；在轨道上运行；[俚语]飘飘然

(1)earth orbit地球轨道

(1)orbit determination轨道计算，定轨

(1)low earth orbit近地轨道

(1)circular orbit圆轨道

(1)elliptical orbit卫星椭圆轨道；椭圆轨迹