標題: 地平線上的彗巴 [打印本頁] 作者: charles 時間: 2009-3-27 10:52 標題: 地平線上的彗巴
A Comet Tail Horizon
影像提供與版權: Marco Fulle (Stromboli online)
Explanation:
What's happening over the horizon? Many a sky enthusiast who thought they had seen it all had never seen anything like this. To the surprise of many Northern Hemisphere observers, the tail of Comet McNaught remained visible even after the comet's head set ahead of the Sun. What's more, visible were bright but extremely rare filamentary striae from the comet's expansive dust tail. The cause of dust tail striae are not known for sure, but are possibly related to fragmentation of comet's nucleus. The last comet to show prominent striae was Comet Hale-Bopp in 1997. Pictured above, the tail of Comet McNaught was caught just after sunset above the Carnic Alps of northern Italy.
