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社评“母乳酱想喷出来”-知识课堂

国际最新研究母乳酱想喷出来:土星环和土星可能一样古老

来源: 深圳新闻网
2024-12-18 01:08:29

最佳回答

“母乳酱想喷出来”国际最新研究母乳酱想喷出来:土星环和土星可能一样古老

  中新母乳酱想喷出来网北京12月17日电(记者 母乳酱想喷出来孙自法)施普林格自然旗下专业学术期刊《自然—地球科学》最新发表一篇行星科学论文称,土星的冰环可能比看上去更古老,因为它们能抵御岩石碎片撞击造成的污染。研究人员认为,土星环虽然看上去干净年轻,但它们可能和土星本身一样古老,这挑战了过去对土星环年龄的估计。

  该论文介绍,土星环曾被认为很古老,可能与大约45亿年前的土星同时形成。科学家此前认为,随着时间推移,微流星体(在太空中穿行的比沙粒还小的岩石碎片)撞击会弄脏组成环的岩石和冰颗粒,使之颜色变深。不过,卡西尼号宇宙探测器在2004年到达土星的时候观察到,土星环看起来相对明亮干净。因此,研究估计土星环的年龄不到4亿年。

  在本项研究中,论文第一作者兼通讯作者、日本地球生命研究所兵頭龍樹(Ryuki Hyodo)和同事及合作者一起,用计算机模型模拟了微流星体和冰环颗粒之间的撞击。他们研究发现,高速撞击会让微流星体汽化,随后汽化物质在土星磁场中膨胀、冷却和凝结,形成带电纳米粒子和离子。

  此次模拟研究表明,这些带电粒子随后要母乳酱想喷出来么与土星碰撞,被拖入它的大气层,要么彻底逃离土星的引力。因此,论文作者认为只有很少的此类物质会沉积在土星环上,这让土星环看起来相对干净。他们推测,极低的污染水平可能意味着土星环实际上已有几十亿年历史,只是维持着年轻的外观。

  论文作者总结指出,虽然后续还需要进一步研究,但本次研究这一过程也可能发生在天王星和海王星的环上,以及巨行星周围的冰卫星上,可为相关行星研究提供借鉴。(完)

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