QQ登录

只需一步,快速开始

The Medusa Nebula

[复制链接]
江涛 发表于 2007-11-23 14:18 | 显示全部楼层 |阅读模式 来自: 中国–江苏–扬州 电信

马上注册,结交更多好友,享用更多功能,让你轻松玩转社区。

您需要 登录 才可以下载或查看,没有账号?加入牧夫(请注明天文爱好者,否则无法通过审核,请勿使用gmail/outlook/aol/icloud邮箱注册)

×

                               
登录/注册后可看大图


Explanation: (xxxedit and linkxxx) Braided, serpentine filaments of glowing gas suggest this nebula's popular name, The Medusa Nebula. Also known as Abell 21, this Medusa is an old planetary nebula some 1,500 light-years away in the constellation Gemini. Like its mythological namesake, the nebula is associated with a dramatic transformation. The planetary nebula phase represents a final stage in the evolution of low mass stars like the sun, as they transform themselves from red giants to hot white dwarf stars and in the process shrug off their outer layers. Ultraviolet radiation from the hot star powers the nebular glow. The Medusa's transforming hot central star is visible in the detailed color image as the small blue star within the upper half of the overall bright crescent shape. Fainter filaments of the nebular gas clearly extend above and to the left of the bright crescent region. The Medusa Nebula is estimated to be over 4 light-years across.


转自成大物理分站
白羊星座 发表于 2007-11-23 15:34 | 显示全部楼层 来自: 中国–甘肃–张掖 电信
收藏,顶起!!!
回复 顶~ 砸~

使用道具 举报

饿魔 发表于 2007-11-23 17:37 | 显示全部楼层 来自: 中国–浙江–杭州 电信
收藏了
回复 顶~ 砸~

使用道具 举报

zheng123 发表于 2007-11-23 21:08 | 显示全部楼层 来自: 中国–上海–上海–闵行区 电信
提示: 作者被禁止或删除 内容自动屏蔽
回复 顶~ 砸~

使用道具 举报

本版积分规则

APP下載|手机版|爱牧夫天文淘宝店|牧夫天文网 ( 公安备案号21021102000967 )|网站地图|辽ICP备19018387号

GMT+8, 2024-12-23 09:31 , Processed in 0.935930 second(s), 19 queries , Gzip On, Redis On.

Powered by Discuz! X3.5 Licensed

Copyright © 2001-2020, Tencent Cloud.

快速回复 返回顶部 返回列表