Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2006 May 5
Jupiter and the Red Spots
Credit: NASA, ESA, A. Simon-Miller (Goddard Space Flight Center), I. de Pater, M. Wong (UC Berkeley)
Explanation: Jupiter's Great Red Spot is a swirling storm seen for over 300 years, since the beginning of telescopic observations. But in February 2006, planetary imager Christopher Go noticed it had been joined by Red Spot Jr - formed as smaller whitish oval-shaped storms merged and then developed the remarkable reddish hue. This sharp Hubble Space Telescope image showing the two salmon-colored Jovian storms was recorded in April. About half the size of the original Red Spot, Red Spot Jr. is similar in diameter to planet Earth. Seen here below and left of the ancient storm system, it trails the Great Red Spot by about an hour as the planet rotates from left to right. While astronomers still don't exactly understand why Jupiter's red spots are red, they do think the appearance of Red Spot Jr. provides evidence for climate change on the Solar System's ruling gas giant.
Tomorrow's picture: light-weekend
木星与它的大红斑
影像提供:NASA, ESA, A. Simon-Miller (Goddard Space Flight Center), I. de Pater, M. Wong (UC Berkeley)
说明:自从开始用望远镜观测以来,木星的大红斑是一个被观察了300多年的涡流风暴。但在2006年2月,行星影像学家Christopher Go注意到它有个小红斑的同伴;它是由较小的白色椭圆形风暴合并而成,后来又呈现出明显的红色。这幅清晰的哈勃太空望远镜影像,呈现了在4月拍摄的这两个肉色的木星风暴。小红斑的大小约是大红斑的一半,它的直径和地球相当。小红斑在古老的风暴系统的左下方,由于木星是由左向右自转,小红斑滞后大红斑大约1小时。虽然天文学家并不很确定为何木星的红斑会是红色的,但他们认为小红斑的出现提供了证据,表明太阳系这颗最大气态行星的气候已经发生变化。(翻译:陈昌)
[ 本帖最后由 夜猫子 于 2006-5-9 09:24 PM 编辑 ] |