How violent these processes were suggested by the odd tilt and spin of many of the planets.
许多行星不寻常的倾斜和自转暗示了这些过程的激烈程度。
Chaos theory was developed by scientists, trying to explain the movement of the planets and the changes in environmental conditions.
混沌理论是由科学家提出的，试图解释行星的运动和环境条件的变化。
For example, Greek astronomers made excellent, very accurate observations of the movements of the planets, but the observations revealed a bit of a problem.
例如，希腊天文学家对行星运动进行了非常出色和精确的观察，但这些观察暴露了一点小问题。
It is hypothesized that the primordial cloud of dust and gas from which all the planets are thought to have condensed had a composition somewhat similar to that of Jupiter.
据推测，所有行星都是由尘埃和气体组成的原始云团凝聚而成，其组成与木星的组成有些相似。
Geocentric means Earth-centered, so the geocentric view holds that the Sun, the planets, and the stars, all revolve around the Earth, which is stationary.
地心论是指以地球为中心，所以地心论认为，太阳、行星和恒星都围绕着地球旋转，而地球是静止的。
The indicators of the Antikythera Mechanism, would then move to show the motion of the Sun and Moon relative to the planets and stars.
这些安提基西拉机械装置的指示器就会移动，显示相对于行星和恒星的日月运动。
If they were shadows of the planets, they would be circular, right?
如果它们是行星的影子，它们就会是圆形的，对吧？
They shunned the belief that there is a link between the alignment of the planets and events on the Earth.
他们回避了在行星的排列和地球上发生的事件之间有联系的看法。
The orderly nature of our solar system leads most astronomers to conclude that the planets formed at essentially the same time and from the same material as the Sun.
我们太阳系的有序特性使大多数天文学家得出结论，这些行星基本上在同一时间形成，且物质来源和太阳的一样。
He developed a mathematical formula describing the distances of the planets from the Sun.
他提出了一个描述各行星与太阳之间距离的数学公式。
No-one had found a way to calculate accurate distances to the planets from the Earth.
还没有人找到方法来计算从地球到行星的精确距离。
Of course, we now know that the planets, including Earth, revolve around the Sun, and that the solar system is only a tiny part of the universe.
当然，我们现在知道，包括地球在内的行星都围绕太阳公转，而太阳系只是宇宙的一小部分。
Copernicus theorized in 1543 that all of the planets that we knew of revolved not around the Earth, but the Sun, a system that was later upheld by Galileo at his own expense.
哥白尼在1543年提出了一个理论，即我们所知道的所有行星不是绕着地球转，而是绕着太阳转的，这一理论后来得到了伽利略的支持，但伽利略本人也为此付出了代价。
Variations in the composition of the planets are largely responsible for the density differences.
行星构成成分的不同是造成密度差异的主要原因。
Since the earliest times, people have looked up at the stars, the moon and the planets.
自人类诞生之初起，人们就仰望星星、月亮和行星。
Now and then these "dirty snow balls" begin to orbit the sun just as the planets do.
时不时地，这些“脏雪球”会像行星一样绕着太阳公转。
An estimated 99.85 percent of the mass of our solar system is contained within the Sun, while the planets collectively make up most of the remaining 0.15 percent.
太阳占据了太阳系总质量的大约99.85%，而在剩余的0.15%中，行星占据了大部分。
Powerful telescopes allow scientists to study the planets.
强大的望远镜使科学家能够研究行星。
Julia: This means that the planets revolve around the sun.
朱莉娅：这个学说认为行星围绕着太阳旋转。
He wanted to know how it could be that the planets orbited the sun.
他想弄明白为什么行星会绕太阳做轨道运行。
A similar phenomenon happens to the planets of our solar system, Shull added.
类似的情况在太阳系的行星中也有发生。
The moon also offers many clues about the time when the planets were formed.
月球还会提供其何时形成的许多线索。
Like our solar system, the planets around Gliese 581 have nearly-circular orbits.
Gliese 581周围的行星拥有同太阳系的行星一样类圆形轨道。
"Volcanism is important because it represents the pulse of the planets," he added.
“火山作用非常重要，因为它代表着行星的脉搏，”他补充道。
Like the solar system, the planets orbiting Gliese 581 have mostly circular orbits.
和太阳系一样，围绕着Gliese 581运行的行星轨道大部分都是圆形的。
Just after sunset, the planets Mercury and Venus are visible quite near each other.
就在日落以后，行星水星和金星看起来彼此离得很近。
The next step is to capture an image of the planets to determine which ones have atmospheres.
下一步是抓拍这些行星的图像，确定哪些行星存在大气。
As mentioned above, the planets are far smaller than the sun both in dimension and mass.
正如上面已提到的，行星在体积和质量上比太阳远为小得多。
He suggests that the planets probably migrated to their current positions after being formed.
他主张的观点是行星很可能是在形成之后才迁移到它们目前的轨道上的。
Light pollution has obscured our view of constellations, meteor showers, and even the planets.
光污染使星座、流星雨甚至行星都变得模糊不清，遮蔽了我们的视线。
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