每日一图 (每日约13.30更新)
What's happening to this cloud? Ice crystals in a distant cirrus cloud are acting like little floating prisms. Known informally as a fire rainbow for its flame-like appearance, a circumhorizon arc appears parallel to the horizon. For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds present below -- in this case cirrus fibratus. The numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a collectively similar manner. Therefore, circumhorizontal arcs are somewhat unusual to see. The featured fire rainbow was photographed in 2021 near North Fork Mountain in West Virginia, USA. Sky Surprise: What picture did APOD feature on your birthday? (after 1995)
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
睡梦中与女孩亲吻
发表于：2023-04-23 03:51:36
双腿残疾的我，下半生的心愿
发表于：2023-03-22 15:47:16
看了几个视频，非常担忧孤独终老
发表于：2022-10-05 17:22:25
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
一起坐客车二天到拉萨的女孩，为什么还不出现呢？
发表于：2022-04-03 09:36:32
老网站彻底放弃了
发表于：2022-08-09 01:56:34
反复做梦，梦见获得大奖
发表于：2023-06-06 06:17:46
我真的失去心中的女孩了吗？
发表于：2022-05-23 20:00:53
再次回忆失忆前后时刻自己的思维内容
发表于：2022-03-23 12:02:48
何以解忧，唯有暴富，今天最后的希望
发表于：2023-01-18 00:59:20
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 :992400 .
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