The trampoline function " : Elon Musk, founder of SpaceX, which has sent Saturday two astronauts in space, has responded to the patron saint of the Russian space agency, which was laughed at six years ago of america's failure to lead in human spaceflight.

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In a period of tension between the two countries, while Moscow is threatening to suspend space cooperation with Washington, Dmitry Rogozin had said in 2014 that the astronauts americans might well have needed a trampoline to reach the ISS.