http://news.yahoo.com/astronauts-see-theyre-plummeting-back-184002062.html
"When astronauts return from the International Space Station, their capsule hits the atmosphere at a speed of more than 17,000 miles per hour.
When they look out the window, this is what they see:"
"The sparks are the result of the huge amount of heat (roughly 3,000°F) that builds up on the surface of the Soyuz capsule due to friction with the Earth's atmosphere. (The astronauts are protected from all this heat by a heat shield that faces the Earth as the capsule descends)"

"When astronauts return from the International Space Station, their capsule hits the atmosphere at a speed of more than 17,000 miles per hour.
When they look out the window, this is what they see:"
"The sparks are the result of the huge amount of heat (roughly 3,000°F) that builds up on the surface of the Soyuz capsule due to friction with the Earth's atmosphere. (The astronauts are protected from all this heat by a heat shield that faces the Earth as the capsule descends)"
