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太阳系存在第五颗气体行星

所属:社会热点 来源:Daily Mail 阅读:2989 次 评论:1 条 [我要评论]  [+我要收藏]

小编摘要:近日,美国的科学家研究发现,太阳系中存在着第五颗气体行星,它曾经被太阳系排除,从而成为了“孤儿”。

导读:科学家们相信太阳系可能存在着第五颗气体行星,它曾从太阳系中排除出去成为了“孤儿”。在美国科学家大卫的一项新研究中,使用了不同的计算机模拟来探索四十亿年前太阳系究竟长什么样。他发现过去的行星并没有踏上它们现存的固定轨道,而是不断地迁移和随处环绕。

Scientists believe our solar system may have once had a fifth gas planet that was ejected from the solar system and "orphaned".

A new study by David Nesvorny, from the Southwest Research Institute in Colorado, U.S., used different computer simulations to explore what the solar system looked like four billion years ago.

He discovered that back then planets had not yet settled into their existing orbits as they migrated and moved around.

However, after a series of tests he worked out that the solar system we recognise today could never have emerged without the existence of a fifth planet

He came to this conclusion by using several different starting positions and ran computer simulations using the four gas planets - Jupiter, Saturn, Uranus and Neptune - but discovered they were to large and one would destroy another eventually.

Even using configurations where the gas planets survived, the solar system's rocky planets like Mars and Venus did not.

However, once Mr Nesvorny had introduced a fifth planet into the equation he found the odds of the current solar system emerging increased dramatically.

This theory is backed up by the recent discovery of many rogue planets.

Mr Nesvorny wrote: "Some of the statistically best results were obtained when assuming that the solar system initially had five giant planets and one ice giant, with the mass comparable to that of Uranus and Neptune, was ejected to interstellar space by Jupiter. "

"This possibility appears to be conceivable in view of the recent discovery of a large number free-floating planets in interstellar space, which indicates that planet ejection should be common."

The orphaned planet is believed to be an ice planet similar in size and make-up to Neptune and Uranus.

Mr Nesvorny believes it was ejected from the solar system into the Milky Way at some point as it could not survive Jupiter's gravitational force, Scientific American said.

标签:太阳系 行星
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2011-09-22 09:14 编辑:Relaxkuma
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