Head-on Contrails
A contrail from an airplane flying towards the observer can appear to be generated by an object moving vertically. On November 8, 2010 in California, U.S., a contrail of this type gained wide media attention as a "mystery missile" that could not be explained by U.S. military and aviation authorities, and its explanation as a contrail took more than 24 hours to become accepted by U.S. media and military institutions.
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