WEBVTT

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Intro music.

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The third and final main engine has been installed on

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Space Shuttle Discovery at NASA's Kennedy Space Center in Florida.

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The engines will provide part of the driving force for the Space Shuttle on its Return to Flight mission to the International Space Station.

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"Behind me, what we're seeing today is the installation of the third engine on the Discovery vehicle.

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That's a major milestone for NASA on Return to Flight."

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Among the three engines, one is making its fifth space flight,

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one is making its third, and one is flying for the very first time on the mission, which is targeted for May's launch planning window.

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Weighing in at just over 7,000 pounds each,

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the Space Shuttle Main Engines are the largest reusable liquid rocket engines in the world.

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During liftoff, they use up more than half a million gallons of fuel and generate as much energy as 23 Hoover Dams.

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The Boeing Company's Rocketdyne Propulsion and Power division builds the engines for NASA.

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"We're very proud to accomplish that milestone for NASA, which is going to lead us on Return to Flight, and we'll be very proud to be there."

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Returning the Space Shuttle to flight is the first step in

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NASA's Vision for Space Exploration, which calls for man to return to the Moon, then on to Mars and beyond.

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