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" ... For centuries, people around the world have enjoyed fireworks to mark celebrations and as entertainment unto themselves. The advent of microsatellites, however, makes possible a more dramatic form of heavenly display: shooting stars that emit light while soaring through the mesosphere, about 60 to 80 km above our planet. ... "
" ... These twilight phenomena or twilight effects occur when the unburned fuel particles in the rocket trail and water condense, freeze and then expand in the thinner upper atmosphere. Because rocket trails extend high into the stratosphere and mesosphere (see figure below), they catch high altitude sunlight long after the sun has set on the ground. The small exhaust particles diffract sunlight and produce pink, blue, green and orange colours, making the twilight phenomenon all the more spectacular. ... "