(Month sixth days JiaZi,), February 7, 1984, the first spacewalk of the human experiment. the the multiplicative knapsack manual


rocket device flight
1984, two American astronauts when they freely from the space shuttle "Challenger" in flying out after first became two human satellite. This miracle created by astronaut Bruce - McCandless and Robert-L-Stewart, is a guarantee of human work in space at random device test. McCandless for the first time to unlock the tether in space walk 170 meters.