Twilight Phenomenon Twilight phenomenon is produced when unburned missile or rocket propellant particles and water left in the vapor trail of a launch, freeze in the less dense upper atmosphere.
(Twilight Phenomenon Twilight phenomenon; is produced; ) (unburned missile or rocket propellant particles and water; left; L:in the vapor trail of a launch) (unburned missile or rocket propellant particles and water left in the vapor trail of a launch; freeze; in the less dense upper atmosphere)
Twilight Phenomenon Twilight phenomenon unburned missile or rocket propellant particles and water unburned missile or rocket propellant particles and water left in the vapor trail of a launch
is produced left freeze
L:in the vapor trail of a launch
in the less dense upper atmosphere