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UNITED STATES - SEPTEMBER 14: Sen. Bill Nelson, D-Fla., speaks during the news conference to announce the design for the Space Launch System, NASA's next-generation rocket,  on Wednesday, Sept. 14, 2011. (Photo By Bill Clark/Roll Call)

UNITED STATES - SEPTEMBER 14: Sen. Bill Nelson, D-Fla., speaks during the news conference to announce the design for the Space Launch System, NASA's next-generation rocket, on Wednesday, Sept. 14, 2011. (Photo By Bill Clark/Roll Call)

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