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The Discovery space shuttle, mated with a Boeing 747 carrier aircraft, flies over the Washington Dulles International Airport in Chantilly, Virginia, USA By: Michael Reynolds / EPA Eye Candy, Discovery Notsara, Jets Planes, Discovery Spaces, Discovery Flying, Boeing 747, Air Sea Spaces Railings Track, Discovery Piggy, Breathtak Photo
The space shuttle Discovery rides atop a Boeing 747 as it flies past Washington, on April 17, in Arlington, Virginia. The retired shuttle was traveling to the Smithsonian's Air and Space Museum's Udvar-Hazy Center in Chantilly, Virginia, where is will go on display. This photograph was taken at the Top of the Town in Arlington, Virginia.
The space shuttle Discovery, attached to a modified NASA 747 aircraft, takes off headed for its final home at The Smithsonian National Air and Space Museum's Steven F. Udvar-Hazy Center in Chantilly, Virginia, from the Kennedy Space Center in Cape Canaveral, Florida April 17. Joe Skipper / Reuters
US space shuttle Discovery sitting atop NASA's 747 shuttle carrier aircraft flies over Washington monument in Washington, DC, on April 17, 2012 as it arrives from Kennedy Space Center in Florida to be displayed at the National Air and Space museum. AFP PHOTO/ MLADEN ANTONOV
People gather at the base of the Washington Monument to watch as the U.S. space shuttle Discovery, on the back of a NASA 747 transport jet, flies over the National Mall on its way to its permanent display at the Smithsonian Institution, in Washington, April 17.
~ Endeavour ~ The space shuttle Endeavour,fresh from the STS-126 mission and mounted atop its modified Boeing 747 carrier aircraft, flies over California's Mojave Desert on a three-day trip back to the Kennedy Space Center in Florida on Wednesday Dec. 10, 2008. By AP Photo/NASA
The ET (External Tank) is the largest element of the space shuttle, and when loaded, it is also the heaviest. It consists of three major components: the forward liquid oxygen (LOX) tank an unpressurized intertank that contains most of the electrical components the aft liquid hydrogen (LH2) tank; this is the largest part, but it is relatively light, due to hydrogen's very low density. Those 2 chemicals funnel out of the engine and when combined energy is released.