First to answer will be the brainliest answer both questions 4 and 5 and don't answer if you don't know what the answer is i need the answer asap

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19