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Around mid august 2007 there was a dark line or shadow that went from horizon to horizon across the sky. It went through the middle of the sun as to divide the sky in half; it was around 11:30 am and it only lasted a few minutes. What was this? What caused it? Note from ScienceLine moderator: (Seen at Madisonville, KY)
Question Date: 2007-08-31
Answer 1:

It's hard to guess without seeing a picture, but I have seen something similar after a jet flew overhead. The line I saw was much darker than an ordinary contrail from a jet. But some older and/or military jets use a LOT more fuel than modern passenger jets, and they can produce much darker contrails. Fighter planes using afterburners are another example. Some of these planes fly so high that you don't see the plane itself, only the contrail. So I don't know if that's what caused the line you saw, but it might be one possibility.

Answer 2:

I am guessing it was the shadow of a contrail, but I really can't say without more description or without a repeat of the same occurrence. What we know about science we know because of repeated observations and/or experiments, not individual happenings.

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