CNNW AM Wake Up Call July 21, 2011
shuttle. we are now less than one hour away from the final space shuttle landing. just in the last half-hour, we got a go for landing from nasa. the deorbit burn took place in the last couple of minutes. in the burn, the shuttle's engines are fired to help it slow down before it hits the atmosphere. in less than 30 minutes the shuttle and crew will start to feel the effects of the atmosphere. they'll be about 80 miles above the earth at that point. as the shuttle comes through the atmosphere, it heats up to about 5,000 degrees on the outside. when it breaks through the atmosphere, ma...