Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. The 154 foot long ET is the largest non-reusable component in the Shuttle system . After carrying over 500,000 gallons of liquid propellant to feed the shuttle's main engines during liftoff, its ultimate fate is to re-enter the atmosphere, break up and descend into a remote ocean area. The side of this ET shows a normal burn scar caused during the separation of one of the reusable solid rocket boosters .
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