Hi Oscar and others, I assumed that the "30 minutes" observation time did not refer to the photo's exposure, which I think was a simple snapshot of some phenomenon that lasted 30 minutes. Could the phenomenon be a persistent exhaust trail from an airplane? I have often seen short trails like this left behind for some time in the sky after the airplane is long gone into a different airmass where their trail disperses more rapidly. I think 30 minutes is quite reasonable for such an artificial cloud to be visible - especially as low on the horizon (far away) as in the photo. Cheers, -Tyler >"Oscar A. Rodriguez / PMEE-SPACE" wrote: >> I received a photo via e-mail yesterday. It depics what it appears to be > >an airplane trail in the sky. > >The observation > > lasted around 30 minutes > > >I have my doubts about those 30 minutes observation time. Everything would >be highly overexposed ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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