BYR Achieve · 镜像论坛

继承前人的ZZ每日一图081213

2008/12/13镜像同步4 回复

A Spectre in the Eastern Veil Credit & Copyright: Paul Mortfield, Stefano Cancelli Explanation: Menacing flying forms and garish colors are a mark of the Halloween season. They also stand out in this cosmic close-up of the eastern Veil Nebula. The Veil Nebula itself is a large supernova remnant, the expanding debris cloud from the death explosion of a massive star. While the Veil is roughly circular in shape covering nearly 3 degrees on the sky in the constellation Cygnus, this portion of the eastern Veil spans only 1/2 degree, about the apparent size of the Moon. That translates to 12 light-years at the Veil's estimated distance of 1,400 light-years from planet Earth. In this composite of image data recorded through narrow band filters, emission from hydrogen atoms in the remnant is shown in red with strong emission from oxygen atoms in greenish hues. In the western part of the Veil lies another seasonal apparition, the Witch's Broom. 说明: 怪异的形态和花哨的颜色是万圣节的标志。这些特点在这张面纱星云的照片中也很突出。面纱星云本身是一个巨大的超新星遗迹，这是巨恒星濒死时爆炸产生的残骸云体，正在不断扩张。面纱星云大约呈现圆形，覆盖大约3度的空间，位于天鹅座中，其东部仅仅覆盖1/2度，大约是月亮的视大小。在面纱星云1400光年的估计距离上，3度相当于12光年范围。这张合成的通过窄带滤光片拍摄的照片中，氢原子的辐射用红色来表示，氧原子的强烈辐射用绿色来表示。面纱星云的西部还有另一个鬼魅一般的遗迹 — 女巫的扫帚。原文：http://antwrp.gsfc.nasa.gov/apod/ap081101.html 译文：http://www.astron.sh.cn/picbase/daily/2008/0812/081213/daily.htm

订阅后，新回复会通过你的通知中心匿名送达。