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Twilight contrails...
I just stumbled across this thread by pure coincidence, and thus found the explanation for the phenomenon I spied high in the Brisbane western sky at sunset ~18.00hrs 28/04/08. It was only a short contrail that kept a constant length as the object moved. I watched it for a good 5 min and was sure it was a high altitude plane, which was also sparkling like a star as it reflected the sun's rays down to me in just-twilit Ascot.
Being intrigued by all things astronomical and cosmological ... I'm now hooked & happy to join y'all.
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