行星时是一个由七个可见行星参与构成以古代时间系统。这七大行星分别统治着每一天和每一天的不同部分。
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。
Comets formed in circular orbits but were gravitationally flung into their present-day elliptical orbits when they ventured too close to planets.
当天文学家在找出遥远群星中有潜在可居住性的行星时,星体的年龄问题则变得相当重要。
And the question of age becomes pretty important as astronomers seek out potentially habitable planets orbiting distant stars.
在3个世纪前,博学多才的克里斯托弗·雷恩爵士曾预言道:“当人类发现类地球行星时,人类开阔眼界的时候就来临了。”
THREE centuries have passed since the polymath Sir Christopher Wren predicted that “a time will come when men will stretch out their eyes—they should see planets like our Earth.”
That was Cartesian space. When I plot r as a distance out from the nucleus that is sort of our simple-minded planetary model. Now let's look at energy.
笛卡尔坐标系,当我用r表示,离原子核的距离时,那只是我们头脑中简单的,类似行星的模型,现在我们看一下能量问题。
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