QQ登录

只需一步,快速开始

重大新闻:英国每日邮报11月30日关于水星有水的最新报道

[复制链接]
人与自然 发表于 2012-11-30 23:58 | 显示全部楼层 |阅读模式 来自: 中国–广东–中山 电信

马上注册,结交更多好友,享用更多功能,让你轻松玩转社区。

您需要 登录 才可以下载或查看,没有账号?加入牧夫(请注明天文爱好者,否则无法通过审核,请勿使用gmail/outlook/aol/icloud邮箱注册)

×
本帖最后由 人与自然 于 2012-12-1 00:22 编辑

http://www.dailymail.co.uk/sciencetech/article-2240702/Ice-Mercury-Nasa-probe-reveals-planet-frozen-organic-materials-north-pole.html
Burning hot Mercury has ice and frozen organic materials inside permanently shadowed craters in its north pole, Nasa scientists said today.
Earth-based telescopes have been compiling evidence for ice on the planet closest to the sun for 20 years, but researchers were left surprised after finding of organics.
Nasa's MESSENGER spacecraft, the first probe to orbit Mercury, has revealed the materials are similar to tar or coal. They are believed to have been delivered millions of years ago by comets and asteroids crashing into the planet.
简单翻译一下:
NASAD的科学家今天说,炙热的水星在其北极地区永久背阴处的陨石坑中有冰和冷冻的有机物。20年来,科学家一直在搜集整理这个距离太阳最近的星球存在有水的证据,但是发现冰冻有机物,仍然令科学家们惊异不已。


                               
登录/注册后可看大图

Radar image: The red shows areas of Mercury's north polar region that are in shadow in all images acquired by MESSENGER to date. They are believed to contain ice
红色区域显示为水星北极地区,在信使号水星探测器拍摄的所有图片中,这些地区处于阴影般隐蔽之处,因此科学家认为这些地区有冰


                               
登录/注册后可看大图
A radar image of Mercury's north polar region. Yellow areas denote regions of high radar reflectivity. Since their discovery in 1992, these polar deposits have been hypothesised to consist of water ice trapped in permanently shadowed areas
水星北极地区的雷达图,黄色区域具有很高的雷达反射率,自从1992年这些处于阴暗处的环形山陨石坑被发现以来,这些区域已被假设存在有水冰。

'It's not something we expected to see, but then of course you realise it kind of makes sense because we see this in other places,' such as icy bodies in the outer solar system and in the nuclei of comets, planetary scientist David Paige, with the University of California, Los Angeles, said.
Unlike Nasa's Mars rover Curiosity, which will be sampling rocks and soils to look for organic materials directly, the MESSENGER probe bounces laser beams, counts particles, measures gamma rays and collects other data remotely from orbit.
The discoveries of ice and organics, painstakingly pieced together for more than a year, are based on computer models, laboratory experiments and deduction, not direct analysis.
'The explanation that seems to fit all the data is that it's organic material,' said lead MESSENGER scientist Sean Solomon, with Columbia University in New York.
Added Paige, 'It's not just a crazy hypothesis. No one has got anything else that seems to fit all the observations better.'
Scientists believe the organic material, which is about twice as dark as most of Mercury's surface, was mixed in with comet- or asteroid-delivered ice eons ago.
The ice vaporised, then re-solidified where it was colder, leaving dark deposits on the surface. Radar imagery shows the dark patches subside at the coldest parts of the crater, where ice can exist on the surface.


                               
登录/注册后可看大图

A 68-mile-diameter crater in the north polar region of Mercury which has been shown to harbour water ice, thanks to measurements by the Messenger spacecraft
按照信使号探测器的的数据和图片,北极地区这个直径达68英里的环形山,一直显示出有水冰的迹象


                               
登录/注册后可看大图
Scientists working with Nasa's MESSENGER spacecraft program explain the new findings during a press conference at Nasa headquarters in Washington, DC
华盛顿DC的NASA总部,科学家团队在解释水星的水冰和冰冻有机物问题


                               
登录/注册后可看大图
(Left to right) Sean Solomon, David Lawrence, Gregory Neumann and David Paige revealed recent studies performed by the spacecraft indicate support for the theory Mercury planet harbours abundant water ice and other frozen materials
科学家们宣读了他们的研究报告,这些报告的工作由自信使号探测器完成,证明了水星有水和冰冻有机物

The areas where the dark patches are seen are not cold enough for surface ice without the overlying layer of what is believed to be organics.
So remote was the idea of organics on Mercury that MESSENGER got a relatively easy pass by Nasa's planetary protection protocols that were established to minimize the chance of contaminating any indigenous life-potential material with hitchhiking microbes from Earth.
Scientists don't believe Mercury is or was suitable for ancient life, but the discovery of organics on an inner planet of the solar system may shed light on how life got started on Earth and how life may evolve on planets beyond the solar system.
'Finding a place in the inner solar system where some of these same ingredients that may have led to life on Earth are preserved for us is really exciting,' Paige said.
MESSENGER, which stands for Mercury Surface, Space Environment, Geochemistry and Ranging, is due to complete its two-year mission at Mercury in March.
Scientists are seeking Nasa funding to continue operations for at least part of a third year. The probe will remain in Mercury's orbit until the planet's gravity eventually causes it to crash onto the surface.
Whether the discovery of organics now prompts Nasa to select a crash zone rather than leave it up to chance remains to be seen. Microbes that may have hitched a ride on MESSENGER likely have been killed off by the harsh radiation environment at Mercury.
The research is published in this week's edition of the journal Science.

Read more: http://www.dailymail.co.uk/sciencetech/article-2240702/Ice-Mercury-Nasa-probe-reveals-planet-frozen-organic-materials-north-pole.html#ixzz2Dit4oS7O

评分

参与人数 1牧夫币 +20 收起 理由
gohomeman1 + 20 信息

查看全部评分

空隐澈 发表于 2012-12-1 00:33 | 显示全部楼层 来自: 中国–重庆–重庆 联通
本帖最后由 空隐澈 于 2012-12-1 00:35 编辑

如此靠近太阳也可以这么凉快,哈哈
回复 顶~ 砸~

使用道具 举报

heid 发表于 2012-12-1 01:10 | 显示全部楼层 来自: 中国–浙江–温州 电信
提示: 作者被禁止或删除 内容自动屏蔽
回复 顶~ 砸~

使用道具 举报

sjcckj 发表于 2012-12-1 08:59 | 显示全部楼层 来自: 中国–山东–青岛 电信/广电网
在冷热中间带有可能存在有机物甚至生命啊
回复 顶~ 砸~

使用道具 举报

Toghter 发表于 2012-12-1 10:34 | 显示全部楼层 来自: 中国–陕西–西安 电信
  那在 岩层中 会不会 有微生物?
回复 顶~ 砸~

使用道具 举报

本版积分规则

APP下載|手机版|爱牧夫天文淘宝店|牧夫天文网 ( 公安备案号21021102000967 )|网站地图|辽ICP备19018387号

GMT+8, 2024-11-14 18:53 , Processed in 0.085954 second(s), 19 queries , Gzip On, Redis On.

Powered by Discuz! X3.5 Licensed

Copyright © 2001-2020, Tencent Cloud.

快速回复 返回顶部 返回列表