每日一图 (每日约13.30更新)
Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After only a few million years for the most massive stars, the enriched material is blasted back into interstellar space where star formation can begin anew. The expanding debris cloud known as Cassiopeia A is an example of this final phase of the stellar life cycle. Light from the supernova explosion that created this remnant would have been first seen in planet Earth's sky about 350 years ago, although it took that light 11,000 years to reach us. This sharp NIRCam image from the James Webb Space Telescope shows the still hot filaments and knots in the supernova remnant. The whitish, smoke-like outer shell of the expanding blast wave is about 20 light-years across. A series of light echoes from the massive star's cataclysmic explosion are also identified in Webb's detailed images of the surrounding interstellar medium.
最新异域文明研究活动 发起新活动
推荐阅读： (only temp appear)
投稿发表在首页
再次回忆北京五道口吃饭时遇到的女孩
发表于：2022-09-08 15:52:55
睡梦中与女孩亲吻
发表于：2023-04-23 03:51:36
看了几个视频，非常担忧孤独终老
发表于：2022-10-05 17:22:25
双腿残疾的我，下半生的心愿
发表于：2023-03-22 15:47:16
比较认真的对待抖音上女性求偶求婚视频
发表于：2022-06-25 02:06:09
小黄狗临死也要死在远方
发表于：2023-03-27 06:51:36
决定研究分布式部署网站
发表于：2022-04-13 02:49:38
命运之神，我该如何外出消耗体重呢？
发表于：2022-08-27 16:54:35
福彩还是不行
发表于：2022-02-25 19:00:14
茫然无知中需要奋起
发表于：2023-04-16 02:30:38
科技渴求榜 渴求
今天，又是渴求大奖
(IMP: 2700 )
一直为表弟的肾衰竭担心，异域文明请传授治疗技术
(IMP: 700 )
我的人生生存和发展基础难道是可鄙的？
(IMP: 200 )
用户，头衔，积分
User 吴鹏 has points :990200 .
ACQs :
34
CCAs:
16
ACCS:
7
User peng wu has points :48400 .
ACQs :
2
CCAs:
0
ACCS:
0
User wup has points :3800 .
ACQs :
0
CCAs:
0
ACCS:
0
User 我来自于星空 has points :1200 .
ACQs :
0
CCAs:
0
ACCS:
0
User Ernestnip has points :1000 .
ACQs :
0
CCAs:
0
ACCS:
0