加载中…“卡西尼号”传回图像显示土星堪称古董
(2013-04-03 09:12:47)
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分类： 科学与技术 |
一项对美国国家航空航天局（NASA）“卡西尼号”（Cassini）飞船数据的最新分析表明，土星（Saturn）的卫星和星环大约是在太阳系诞生之际产生的“陈年古董”，现已老态微现。
尽管这些星体的表面因最近受到“污染”而变色，但它们的年龄却可追溯到超过40亿年前。它们始于太阳系的原行星状星云开始构成行星体之时，这些星云是在太阳开始燃烧成为恒星后仍然环绕太阳旋转的物质云。这份分析报告由参与“卡西尼号”计划的位于罗马（Rome）的意大利国家天体物理研究所（Italy's National Institute for Astrophysics）科学家姜瑞克·菲拉基奥内（Gianrico Filacchione）领导撰写，不久前刚刚在《天体物理学刊》（Astrophysical Journal）网站上发表。
菲拉基奥内说：“研究土星系统有助于我们了解整个太阳系的化学和物理演变过程。我们现在知道，了解这一演变过程不仅需要研究每个单独的卫星或星环，而且需要将这些星体之间的关系相互结合起来。”
土星位于这幅由“卡西尼号”拍摄的照片的左侧，但由于太暗而无法看到。位于照片中央的土卫五（Rhea）（直径1,528千米），因距离“卡西尼号”最近而显得最大。土卫二（Enceladus）（直径504千米）位于土卫五的右侧。土卫四（Dione）（直径1,123千米）位于土卫五的左侧，部分被土星遮挡。
“卡西尼－惠更斯”（Cassini-Huygens）项目是由美国国家航空航天局、欧洲航天局（European Space Agency）和意大利航天局（Italian Space Agency）合作进行的一个项目。
有关土星的卫星和星环的更多信息请见美国国家航空航天局新闻稿。
Read more: http://iipdigital.usembassy.gov/st/chinese/inbrief/2013/04/20130401145028.html#ixzz2PMIKzF00
Saturn Is Like an Antiques Shop, Cassini Suggests
http://photos.state.gov/libraries/amgov/3234/week-4/03292013_pia12771-640_600.jpg
A new analysis of data from NASA’s Cassini spacecraft suggests that Saturn’s moons and rings are gently worn vintage goods from around the time of the solar system’s birth.
A new analysis of data from NASA’s Cassini spacecraft suggests that Saturn’s moons and rings are gently worn vintage goods from around the time of the solar system’s birth.
Though they are tinted on the surface from recent “pollution,” these bodies date back more than 4 billion years. They are from around the time that the planetary bodies in the neighborhood began to form out of the protoplanetary nebula, the cloud of material still orbiting the sun after its ignition as a star. The paper, led by Gianrico Filacchione, a Cassini participating scientist at Italy’s National Institute for Astrophysics, Rome, has just been published online by Astrophysical Journal.
“Studying the Saturnian system helps us understand the chemical and physical evolution of our entire solar system,” said Filacchione. “We know now that understanding this evolution requires not just studying a single moon or ring, but piecing together the relationships intertwining these bodies.”
Saturn is present on the left of this Cassini image but is too dark to see. Rhea (1,528 kilometers across) is closest to Cassini and appears largest at the center of the image. Enceladus (504 kilometers across) is to the right of Rhea. Dione (1,123 kilometers across) is to the left of Rhea, partly obscured by Saturn.
The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency.
For more on Saturn’s moons and rings, see the NASA press release.
Read more: http://iipdigital.usembassy.gov/st/english/inbrief/2013/03/20130329144958.html#ixzz2PMIOC3Fv
| http://solarsystem.nasa.gov/images/Saturn1.jpg | http://solarsystem.nasa.gov/images/spacer.gif | |
| http://solarsystem.nasa.gov/images/spacer.gif | http://solarsystem.nasa.gov/images/spacer.gif | http://solarsystem.nasa.gov/images/spacer.gif |
| http://solarsystem.nasa.gov/images/spacer.gifWhile cruising around Saturn in early October 2004, Cassini captured a series of images that have been composed into this large global natural color view of Saturn and its rings. |
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A Splendor Seldom Seen
NASA's Cassini spacecraft has delivered a glorious view of Saturn,
taken while the spacecraft was in Saturn's shadow. The cameras were
turned toward Saturn and the sun so that the planet and rings are
backlit. (The sun is behind the planet, which is shielding the
cameras from direct sunlight.) In addition to the visual splendor,
this special, very-high-phase viewing geometry lets scientists
study ring and atmosphere phenomena not easily seen at a lower
phase.
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