26. How many engines are needed for the Space Shuttle? (A K2S Question)

From The Space Library

The Shuttle has two solid rocket boosters and three main engines that run on hydrogen and oxygen. Both the solid rockets must fire to launch the Shuttle. But if one of the main engines should fail, the Shuttle can still ascend into orbit, or it can abort to Africa or Europe, or it can return back to the launch site, depending on when the failure occurs during the ascent.

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Answer provided by Jon H. Brown

Question and Answer extracted from the book Kids to Space - by Lonnie Schorer

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