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The Space Shuttle was a crewed, partially reusable low Earth orbital spacecraft operated by NASA from 1981 to 2011.

46 votes
2 answers
7k views

Why were the Space Shuttle's main engines placed on the orbiter?

Since the main engines can't be used after external tank separation, what's the reason for having the engines on the orbiter rather than just building a third rocket on the stack instead of the extern …
Brad's user avatar
  • 878
12 votes
2 answers
5k views

What holds the Space Shuttle orbiter itself stable on the launch pad?

From a structural point of view, what is holding up the orbiter on the launch pad prior to a launch? Are the tail service masts more than just a collection of conduits and plumbing? Or, are the solid …
Brad's user avatar
  • 878