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2014年雅思阅读(社科类):Bode's law lives

2014-04-29 16:08:47来源:网络 柯林斯词典

  There is, in other words, starting to be enough evidence to suggest that Bode’s law might not be a complete fluke. But why might planetary orbits obey such neat patterns, at least some of the time? The researchers speculate that it could be a side-effect of the mechanism by which planetary systems form. Dr Lovis and his colleagues suggest that when many planetary systems first emerge from a disk of dust and gas around a young star, they are "saturated" with planets. Most of the planets are then weeded out by collisions and ejections, caused by gravitational interaction between adjacent planetary bodies. Systems with regular planetary spacings then turn out to have the greatest long-term stability, so that they can be observed today. The researchers observe that "the orbital distances of successive planets with similar masses will tend to obey an approximate exponential law, much like the century-long debated and polemical Titius-Bode law in the Solar System."

  There are several caveats, of course. "We emphasize that we do not consider these Titius-Bode-like ’laws’ as having any other meaning than a possible signature of formation processes," the astronomers insist. Such laws may only apply to relatively small planets relatively close to their suns. Systems dominated by very large "super-Jupiter" planets are probably far more chaotic, with gravitational tussles causing planets to end up in all sorts of strange orbits. And Dr Lovis and his colleagues note that "the physics of planet formation is so diverse and complex that we do not expect any universal rule on planet ordering to exist."

  Still, the idea that there might be something to Bode’s law after all has been advanced by a few researchers in recent years as a serious theoretical possibility. As planet-finding technology improves, more planets are found around other stars and the number of known multiplanetary systems continues to increase, this modern-day revival of Bode’s law can now be put to the test.


本文关键字: 雅思阅读 Bode's law lives

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