The supersonic glide through the atmosphere will overfly dozens of cities and towns, including Fort Peck Lake, Montana; Pierre, South Dakota; Sioux City, Iowa; St. Louis, Missouri; Tupelo, Mississippi; Birmingham, Alabama; and Jacksonville, Florida.
The shuttle is scheduled to enter Earth's atmosphere over the central Pacific Ocean at 8:17 a.m. EDT and should be visible over Montana about a half hour before landing.
As the shuttle descends, observers in the West, where it will still be dark, should see a glowing plasma trail, like a meteorite. In the East, where it will be light, viewers may be able to see a glowing cloud.
Those who can't see the shuttle may at least be able to hear it. The ship's double sonic booms -- shock waves from the nose and the tail of the shuttle -- reach the ground about 90 seconds after the shuttle passes overhead.
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