Article APOD 2006 July 18 mentionned the possibility of the artificial origin of this (or part of) this clouds.
Are there mentions of this kind of clouds anterior to the beginning of the space exploration (say 1957) ?
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- Thu Jul 05, 2007 11:06 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Night-Shining Clouds (2007 Jul 05)
- Replies: 38
- Views: 16783