环粒子通过彼此的重力相互作用和嵌入环中的小卫星保持在适当的位置。这些“牧羊卫星”骑在环粒子上。虽然科学家们一直都知道土星有环,但他们不知道环存在多久以及它们何时形成。有两个主要理论。多年来,科学家们认为这颗行星及其环在太阳系历史的早期出现。他们认为环是由现有材料制成的:尘埃粒子,岩石小行星,彗星和巨大的冰砾。直到1981年开始的旅行者号任务进行的第一次航天器探索之前,该理论一直占据主导地位。图像和数据显示环的变化,即使在短时间内也是如此。卡西尼号任务提供了科学家们仍在分析的额外信息,表明环粒子在短时间内会丢失。关于戒指年龄的另一个线索来自颗粒的非常纯净的水冰构成。科学家认为,这意味着戒指比土星更年轻。随着时间的推移,较老的冰粒会被灰尘染黑。如果这是真的,那么我们现在看到的戒指可能不会追溯到土星的起源。或者,由于土星巨大的引力,当Mimas大小的月球在大约2亿年前偏离土星太近并且分裂时,可能已经创建了当前的环系统。然后,由此产生的碎片将落入土星周围的轨道,形成我们今天看到的环。这个月球分裂场景有可能在这个星球的45亿年生命周期中发挥过很多次。根据这一理论,我们今天看到的戒指只是最新的戒指。也有可能一个非常早期的“泰坦式”世界可能参与环的创建,形成了比现在看到的更大,更大的系统。

美国蒙大拿州天文Essay代写:牧羊卫星

The ring particles are held in place by the gravitational interactions of each other and the small satellites embedded in the ring. These “shepherd satellites” ride on the ring particles. Although scientists have always known that Saturn has rings, they don’t know how long the rings exist and when they form. There are two main theories. For years, scientists have believed that this planet and its rings appeared early in the history of the solar system. They believe that the ring is made of existing materials: dust particles, rock asteroids, comets and huge boulders. The theory dominated until the first spacecraft exploration of the Voyager mission, which began in 1981. Images and data show changes in the ring, even in a short period of time. The Cassini mission provides additional information that scientists are still analyzing, indicating that ring particles are lost in a short period of time. Another clue about the age of the ring comes from the very pure water ice of the particles. Scientists believe that this means the ring is younger than Saturn. Over time, older ice particles will be blackened by dust. If this is true, then the ring we see now may not be traced back to the origin of Saturn. Or, due to the gravitational pull of Saturn, the current ring system may have been created when the Mimas-sized moon was too close to and separated from Saturn about 200 million years ago. The resulting debris will then fall into the orbit around Saturn, forming the ring we see today. This lunar split scene is likely to have played many times in the planet’s 4.5 billion year life cycle. According to this theory, the ring we see today is just the latest ring. It is also possible that a very early “Titan” world may participate in the creation of the ring, forming a larger, larger system than is now seen.

发表评论

电子邮件地址不会被公开。 必填项已用*标注