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"Chemical propulsion is obsolete to go anywhere other than the moon. Three days - that's acceptable. But for Mars, we need propulsion technologies to get us there in, say, 60 days - then spend whatever length of time we want to spend and return when we want to come home."

— Gene Cernan
gene cernan Quotes Three,Chemicals,Acceptable

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Gene Cernan
Three
Chemicals
Acceptable
Obsolete
Mars
Coming Home
Length
Propulsion

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