This view of a Perseid meteor entering Earth's atmosphere is from the perspective of the International Space Station. As astronaut Ron Garan captured the image on August 13, 2011, orbiting at an altitude of about 380 kilometers, the Perseid meteors streak below, sweeping up dust left from comet Swift-Tuttle heated to incandescence. The glowing comet dust grains are traveling at about 60 kilometers per second through the denser atmosphere around 100 kilometers above Earth's surface. In this image, the foreshortened meteor flash is at right, below the curving limb of the Earth and a layer of greenish airglow, just below bright star Arcturus.