A twilight phenomenon is produced when exhaust particles from propellant left in the vapor trail of a spaceship condense, freeze, and then expand in the less dense upper atmosphere. The exhaust plume is then illuminated by high altitude sunlight.
A twilight phenomenon is produced when exhaust particles from propellant left in the vapor trail of a spaceship condense, freeze, and then expand in the less dense upper atmosphere. The exhaust plume is then illuminated by high altitude sunlight.
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