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- Sun Jan 18, 2009 4:06 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Unusual Light Pillars Over Latvia (2009 Jan 12)
- Replies: 176
- Views: 190821
Re: Unusual Light Pillars Over Latvia (2009 January 12)
My guess is that it's a sub-zero cloud of flat, hexagonal ice-crystal platelets. Held in a stable condition below a layer of very slightly warmer air as often happens on a clear, frosty night (at least one star seems to be visible in the photo). In such still conditions the flat crystals would tend ...