External tank workers prepare to pry open a manhole at the bottom of External Tank-119 to swap out a set of engine cut-off sensors with new ones in preparations for NASA's STS-121 shuttle flight. Credit: NASA/Jim Grossmann. Click to enlarge.
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External tank workers prepare to pry open a manhole at the bottom of External Tank-119 to swap out a set of engine cut-off sensors with new ones in preparations for NASA's STS-121 shuttle flight. Credit: NASA/Jim Grossmann. Click to enlarge. |
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