Before revision: A twilight phenomenon (seen from the Louisiana-24 Long Range Tracking Telescope site in northern Santa Barbara county) lights up the night sky over Vandenberg Air Force Base following the launch of a Minuteman III missile September 19, 2002 (Official USAF Photo by Dennis Fisher, 30th Communications Squadron) 300x300px| The twilight phenomenon caused by freezing unspent fuel from a Minotaur I launch at Vandenberg AFB, CA in Sept. 2005|alt= A twilight phenomenon is produced when exhaust particles from missile or rocket propellant left in the vapor trail of a launch vehicle condense, freeze and then expand in the less dense upper atmosphere.
After revision: ,A twilight phenomenon (seen from the Louisiana-24 Long Range Tracking Telescope site in northern Santa Barbara county) lights up the night sky over Vandenberg Air Force Base following the launch of a Minuteman III missile September 19, 2002 (Official USAF Photo by Dennis Fisher, 30th Communications Squadron) 300x300px| The twilight phenomenon caused by freezing unspent fuel from a Minotaur I launch at Vandenberg AFB, CA in Sept. 2005|alt= A twilight phenomenon is produced when exhaust particles from missile or rocket propellant left in the vapor trail of a launch vehicle condense, freeze and then expand in the less dense upper atmosphere.