http://en.wikipedia.org/wiki/Ram_pressure
http://en.wikipedia.org/wiki/Upper_atmosphere
http://www.daviddarling.info/encyclopedia/R/reentry_thermal_protection.html
http://liftoff.msfc.nasa.gov/academy/space/solarsystem/meteors/meteors.html
Bernhard Peucker-Ehrenbrink and Birger Schmitz. Accretion of Extraterrestrial Matter Throughout Earth’s History. Lkuwer Academic/Plenum Publishers, New York: 2001.
Tony Reichardt. Space Shuttle: The First 20 Years. DK Publishing, Inc.: 2002.