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spaceplasma: Above the Clouds Space Shuttle Endeavour being ferried by NASA’s Shuttle Carrier Aircraft as it departs KSC. NASA pilots Jeff Moultrie and Bill Rieke are at the controls of the Shuttle Carrier Aircraft. Photo taken by NASA photographer Robert Markowitz in the backseat of a NASA T-38 chase plane with NASA pilot Greg C. Johnson at the controls. Photo Date: September 19, 2012. Location: Kennedy Space Center, Florida. Photographer: Robert Markowitz Source: NASA - Flickr
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.