凯普生物仪器网论坛教学资源共享科学发现 → 科学家发现反向围绕太阳运行天体


  共有5537人关注过本帖树形打印

主题:科学家发现反向围绕太阳运行天体

美女呀,离线,留言给我吧!
admin
  1楼 个性首页 | 信息 | 搜索 | 邮箱 | 主页 | UC


加好友 发短信
等级:管理员 帖子:22 积分:295 威望:0 精华:0 注册:2003/12/30 16:34:32
科学家发现反向围绕太阳运行天体  发帖心情 Post By:2008/9/16 15:31:45

 北京时间9月12日消息,据英国新科学家杂志报道,目前,科学家在寒冷的“柯伊伯带”(Kuiper belt)发现一颗奇特的天体,它竟然能顺时针围绕太阳旋转,而太阳系内其他天体都是逆时针方向围绕太阳旋转的。这项研究将有助于解释以哈雷彗星为典型的神秘彗星家族的起源。

  这颗新天体被称为“2008 KV42”,位于海王星之外的环状冰体结构——柯伊伯带,它的运行轨道相对于地球轨道平面(又称为黄道)呈103.5°,这意味着当它围绕太阳旋转时,实现上是与其他行星相反的方向运行。

  英属哥伦比亚大学的布雷特·戈德曼领导的研究小组于今年5月首次发现了这颗“独来独往”的天体。观测结果表明,2008 KV42的直径是50公里,其环绕太阳的轨道长度为从天王星至海王星之间距离的两倍,它与太阳之间的距离为20-70天文单位,1个天文单位相当于地球至太阳之间的距离。

  该天体的运行轨道在数亿年里都处于稳定状态,但是天文学家称这颗天体可能诞生于其他宇宙区域。美国马萨诸塞州小行星研究中心的布赖恩·马斯登说,“的确这非常引人好奇地想问2008 KV42究竟诞生于何处。”他指出,这颗天体很可能诞生于与哈雷彗星很相似的诞生地,哈雷彗星也是相对其他星体反向环绕太阳旋转,并有度数较高的倾斜轨道面,像哈雷彗星这样的天体可以持续运行20-200年之间,但是它们要比2008 KV42更接近于太阳。

  目前尚不清楚类似2008 KV42的彗星究竟诞生于何处,计算机模拟显示它们并不会诞生于其他类型彗星的两种出生地——柯伊伯带或更遥远的奥特星云,奥特星云这种冰壳状结构距离太阳20000-200000个天文单位。

  戈德曼研究小组计算2008 KV42出现于柯伊伯带之外,但更接近于奥特星云,奥特星云距离太阳2000-5000个天文单位,许多天文学家称该区域为“内奥特星云”。重力干扰很可能将2008 KV42从内奥特星云中踢了出来,使其出现在当前的轨道。戈德曼称,未来有一天2008 KV42可能会被推出当前轨道,使它进入离太阳更近的轨道上。最终,2008 KV42可能会成为一颗“过渡天体”,并逐渐变成哈雷类型的彗星。

  该研究小组发现至少20个柯伊伯带天体处于陡峭倾斜的轨道平面上,然而却未发现任何一颗反向运行的天体。


携程订房网dingfang51.com 支持(0中立(0反对(0单帖管理 | 引用 | 回复 回到顶部

返回版面帖子列表

科学家发现反向围绕太阳运行天体








签名
In my personal louis vuitton opinion, things happen for replica handbags their own reasons. Counterfeiting handbags goods may never be fully stopped. There are gucci handbags thousands of customers are gucci wallets willing to buy them as long as they are not in chanel handbags such a strong desire to pursue exactly louis vuitton handbags the same quality. O the side of the LVMH, it is chanel wallets also reasonable for them to fight against wholesale handbags items, for they might ruin its high reputation louis vuitton walletsand destroy its flourishing business.
To realize your replica handbags dream actually is not a louis vuitton difficult thing. Even fake handbags if you don't have enough money for gucci handbags a full rate Louis Vuitton Bag, there gucci wallets are items on sales. Our online chanel handbags store is a good choice for you. It can chanel wallets not only help you save money, but also satisfy your needs louis vuitton handbags at the same time. Pay much attention to the sales information; you can easily louis vuitton wallets buy the one you like. Since the product resource is very rich, I am very sure you wholesale handbags can find your favorite one. Want to be a fashionable girl? Then stop hesitating.
Luckily,Swiss replica watches come in the market and meet fake watches the mass market and the rolex watches needs of many common people. They offer a very good chance for replica rolex those average people with a limited budget for the wholesale watches chance to experience the luxury ladies watches that the original watch boasts.As a prominent watch brand fake breitling in the whole world of fake tag heuer making, the brand will surely and fake cartier continually present to the world with many more fake omega excellent watches to its watch lovers and collectors.