Manhasbeentothemoon.Ithasbeenthefirststeptowardsfuturee...
问题详情:Manhasbeentothemoon.Ithasbeenthefirststeptowardsfutureexplorationinspace.WhencomparedwiththedistancesbetweenEarthandtheotherplanets,thedistancebetweentheMoonandEarthisveryshortindeed.Mars,then...