Prof. Scope, on 15 Nov 2010, 19:28, said:
Hmm it probably is an airplane contrail. Excess humidity made it last longer than usual and it eventually "diffused" and got wider.
Everyone is explaining the contrail, without bothering to mention that whatever-the-fuck it is, is going straight UP! Sorry, if airplane can create a contrail like that fine. But no aircraft on the planet would create one from horizon to sky like that.......