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SPINNING TO DEATH

机译:旋转死亡

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"They're just rocks floating out in space. So what?" says UCLA astrophysicist David Jewitt. That's how he used to feel about asteroids. The common wisdom holds that asteroids live placid lives before meeting a predictable, standard death: A pair collide, quickly obliterating each other. But recently, scientists have spotted asteroids behaving and dying in unexpected ways: Some have tails, some break apart into chunks and others disintegrate into smears of dust, with no obvious second asteroid in sight. What the heck? Jewitt has his theories for these space oddities. Some of it is sublimation: an icy asteroid transforming directly into water vapor as it makes its way toward the sun. Rocky asteroids, however, are more complicated. In August 2013, he found an asteroid with six tails - a never-before-seen configuration that he describes as "freakish." Jewitt thought it appeared to be rapidly rotating, and that each tail is the result of "a little avalanche of material" flying off the surface. Just 140 miles across, P5 - short for P/2013 P5 - might be on the brink of breaking up entirely. Later that fall, new data revealed a second asteroid potentially close to a different sort of spinning death: P/2013 R3 consists of 10 separate chunks, floating away from each other at a leisurely speed of 1 mph.
机译:“它们只是漂浮在太空中的石头。那又如何呢?”加州大学洛杉矶分校的天体物理学家戴维·杰威特(David Jewitt)说。那就是他过去对小行星的感受。普遍的看法是,小行星在达到可预见的标准死亡之前就过着平静的生活:一对碰撞,彼此迅速消失。但是最近,科学家发现小行星的行为和死亡方式出乎意料:有些尾巴,有些破碎成碎片,另一些分解成尘土,看不到明显的第二颗小行星。有没有搞错?耶维特对这些太空怪异有自己的理论。其中一些是升华:冰小行星进入太阳时直接转变为水蒸气。然而,岩石小行星更为复杂。 2013年8月,他发现了一颗小行星,它的尾巴有六个,这是他描述为“怪异”的从未见过的构造。杰威特认为它似乎正在快速旋转,并且每条尾巴都是“少量雪崩”从表面飞出的结果。 P5只是140英里宽,是P / 2013 P5的简称-可能即将完全瓦解。那个秋天晚些时候,新数据揭示了第二颗小行星可能接近另一种旋转死亡:P / 2013 R3由10个独立的小块组成,以1 mph的悠闲速度彼此漂浮。

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  • 来源
    《Discover》 |2014年第7期|13-13|共1页
  • 作者

    SHANNON PALUS;

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