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As seen in Gravity, and also in this youtube video: , the Soyuz main engine is covered by a metal plate that it mechanically moved out of the way before firing. What is the function of this covering?
That was my thought too. Lots of things you wouldn't want getting into your handbasket-to-home. Bolts, wrenches, vapour, huge temperature gradients.(8:13)
My naive guess would be a micrometeorite cover.