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Exocomets may beas common as exoplanets系外彗星也许和系外行星一样常见Published: Monday, January 7, 2013 - 16:35in Astronomy Space发表时间：2013年1月7日，星期一 -16:35于《天文学与太空》版块Comets can be seenin this artistic depiction of the young star Beta Pictoris as seen from theouter edge of its disk.NASA image byLynette Cook.彗星可以在这一幅绘架座β星的年轻恒星艺术画的尘埃盘外边缘看到。美国宇航局丽奈特·库克供图Comets trailingwispy tails across the night sky are a beautiful byproduct of our solarsystems formation, icy leftovers from 4.6 billion years ago when the planetscoalesced from rocky rubble. The discovery by astronomers at the University ofCalifornia, Berkeley, and Clarion University in Pennsylvania of six likelycomets around distant stars suggests that comets -- dubbedexocomets -- are just as common in other stellar systems withplanets. 彗星拖着的划破夜空的纤细尾巴，是一个我们的太阳系形成的美丽的副产品，来自46亿年前行星由岩石瓦砾合并而成时的冰冷遗留物。由加利福尼亚大学伯克利分校和位于宾夕法尼亚州的克莱瑞恩大学的天文学家发现的6颗围绕遥远恒星的疑似彗星表明确实是彗星——被称为“系外彗星”——就像在其他恒星系统的行星一样常见。Though only one ofthe 10 stars now thought to harbor comets is known to harbor planets, the factthat all these stars have massive surrounding disks of gas and dust ? a signature of exoplanets -- makes ithighly likely they all do, said Barry Welsh, a research astronomer at UCBerkeleys Space Sciences Laboratory. 虽然已知包含有行星的10颗恒星中只有1颗现在认为包含有彗星，实际上所有这些恒星周围有大量的气体和尘埃——系外行星的标志——使它们极有可能都有彗星，巴里·威尔士说，一名加州大学伯克利分校太空科学实验室的研究天文学家。This is sortof the missing link in current planetary formation studies, Welsh said.We see dust disks -- presumably the primordial planet-forming material --around a whole load of stars, and we see planets, but we dont see much of thestuff in between: the asteroid-like planetesimals and the comets. Now, I thinkwe have nailed it. These exocomets are more common and easier to detect thanpeople previously thought. “在目前的行星形成的研究中，这是种缺失的环节，”威尔士说。”我们看到的尘埃盘——大概是最原始的行星形成物质——围绕在恒星周围塞满了轨道，并且我们看到了行星，但我们没有看到这些填充物之间更多的东西：类小行星的星子和彗星。现在，我想我们已经锁定它了。这些系外彗星较为常见，而且比人们以前认为的更容易探测到。”Welsh will presentthe findings on Monday, Jan. 7, during a m