File-This Oct. 9, 2003, file photo shows John C. Houbolt explaining the size of different rockets required to launch various methods for landing on the moon at Grainger Engineering Library in Urbana, ... more 
File-This Oct. 9, 2003, file photo shows John C. Houbolt explaining the size of different rockets required to launch various methods for landing on the moon at Grainger Engineering Library in Urbana, Ill. Houbolt, an engineer whose contributions to the U.S. space program were vital to NASA's successful moon landing in 1969, has died. He was 95. Houbolt's family confirmed his death Tuesday, April 15, 2014, at a Maine nursing home of complications from Parkinson's disease. (AP Photo/News-Gazette, John Dixon, File) less 
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Associated Press | Photo By News-Gazette, John Dixon, File
Sat, Apr 19, 2014 11:06 PM EDT