gohomeman1 发表于 2009-6-2 14:16

APOD090602- 土星环再现神秘辐条

http://apod.nasa.gov/apod/astropix.html

Spokes Reappear on Saturn's Rings

http://apod.nasa.gov/apod/image/0906/spokes2_cassini.jpg
Credit: Cassini Imaging Team, ISS, JPL, ESA, NASA

Explanation: What causes the mysterious spokes in Saturn's rings? Visible in the above image as light ghostlike impressions, spokes were first discovered by the Voyager spacecraft that buzzed by Saturn in the early 1980s. Their existence was unexpected. Oddly, the spokes more commonly observed when Saturn's rings are more nearly edge on to the Sun, and so were conspicuously absent from initial images sent back by the robot Cassini spacecraft now orbiting Saturn. Analyses of archived Voyager images have led to the conclusions that the transient spokes, which may form and dissipate over a few hours, are composed of electrically charged sheets of small dust-sized particles. Hypotheses for spoke creation include small meteors impacting the rings and electron beams from Saturnian atmospheric lightning spraying the rings. As Saturn approaches equinox, spoke sightings like that pictured above are becoming increasingly common, giving planetary scientists fresh images and data with which to test origin hypotheses.

gohomeman1 发表于 2009-6-2 14:20

本图是卡西尼土星探测器所摄,图像版权:卡西尼土星图像团队、 美国喷气推进实验室、欧洲航天局、美国航空航天局,最后的ISS是Imaging Science Subsystem(图像科学子系统)的缩写,是卡西尼土星图像的官方网站的一部分。这个官网是:
http://ciclops.org/index.php

gohomeman1 发表于 2009-6-2 14:21

先提供APOD“大图”,1012X1012

http://apod.nasa.gov/apod/image/0906/spokes2_cassini_big.jpg

gohomeman1 发表于 2009-6-2 14:24

论坛速度不是一般的慢,不知道是最近国内暴风影音软件bug造成的问题还是论坛本身该升级了,网络流量明显不够了。话说我自己的电脑可以做流量分析,论坛的流量该是论坛自己处理啦。

gohomeman1 发表于 2009-6-2 14:27

检查了一下,我认为今天的成大翻译挺顺溜的,语句清晰通顺,大家看看吧。
http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/apod.html

土星環神祕的輻條
影像提供與版權: Cassini Imaging Team, ISS, JPL, ESA, NASA
說明:
土星環上的神祕輻條之成因為何?上面影像的幽靈狀的烙印稱為輻條,它們是1980年初由飛掠過土星的航行家太空船(Voyager spacecraft)首次發現的。它們的存在並未預期,而到現在也未有可信的形成學說。很有意思的是,當土星環邊緣對著太陽的時候,經常能觀測到輻條特徵,但是現正繞行土星的卡西尼號太空船(Cassini spacecraft)所回傳的首批照片裡,並沒有這種輻條的蹤跡。在分析航行家圖庫影像後,得到這些輻條是種暫發現象的結論,並認為它們可能是種由帶電荷塵埃微粒所聚成之片層狀結構,在形成數個小時後即消失。輻條產生機制的假說,包括小流星撞擊環系與土星大氣閃電噴灑出來的電子束衝撞環系等。這些神祕難解的輻條的觀測及思索它們成因的工作仍在持續之中。當土星接進春分點(equinox)時,像上圖的輻條紋將會更加普遍,而這些新影像與新資料提供科學家檢驗上述假設。

南宫飞云 发表于 2009-6-2 14:32

英文不好,尤其是天文英语!

北回归线 发表于 2009-6-2 14:42

复杂~每日一图这样发的::17::
http://www.phys.ncku.edu.tw/%7Eastrolab/mirrors/apod/image/0906/spokes2_cassini.jpg

北回归线 发表于 2009-6-2 14:44

点击就是大图了:lol

gohomeman1 发表于 2009-6-2 17:26

成大的图片速度一贯来不快,我只要可能就不链接它的图。文字是copy的。到现在北京天文馆还没提供今天的APOD镜像呢。

北回归线 发表于 2009-6-2 21:36

本帖最后由 北回归线 于 2009-6-2 21:44 编辑

哦~nasa的也可以这样。。。。。。。。。。。。。。。。::0023::http://apod.nasa.gov/apod/image/0906/spokes2_cassini.jpg
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