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. Click Here to return to the search form.
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