A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, does its speed

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

a skateboard rolling across the street - apex