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执着的每日一图081216

2008/12/16镜像同步3 回复

Crescent Saturn Explanation: Saturn never shows a crescent phase -- from Earth. But when viewed from beyond, the majestic giant planet can show an unfamiliar diminutive sliver. This image of crescent Saturn in natural color was taken by the robotic Cassini spacecraft in May. The image captures Saturn's majestic rings from the side of the ring plane opposite the Sun -- the unilluminated side -- another vista not visible from Earth. Pictured are many of Saturn's photogenic wonders, including the subtle colors of cloud bands, the complex shadows of the rings on the planet, the shadow of the planet on the rings, and the moons Mimas (2 o'clock), Janus (4 o'clock), and Pandora (8 o'clock). As Saturn moves towards equinox in 2009, the ring shadows are becoming smaller and moving toward the equator. During equinox, the rings will be nearly invisible from Earth and project only an extremely thin shadow line onto the planet. 弦月状的土星说明: 从地球上看去，没人见过弦月状的土星。但如果你乘坐飞船飞越土星，会发现这颗巨大的行星有时也会出现状如弯月的景象。上图这张以自然色拍摄的弦月状土星是2007年5月由卡西尼号宇宙飞船拍摄的，从背向太阳的那一面补捉到土星美丽的光环，展现出地球上无法得见的景像。照片中的许多细节令人称奇，例如土星云带的微妙色彩，土星映在环上的影子，以及土卫一(两点钟方向)、土卫十(四点钟方向)和土卫十七(八点钟方向)。原文：http://antwrp.gsfc.nasa.gov/apod/ap071023.html 译文：http://www.astron.sh.cn/picbase/daily/2008/0801/080122/daily.htm

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