First artificial satellite consisting of a 58 cm pressurized aluminium shell containing two 1 W transmitters for a total mass of 83.6 kg. October 4, 1957 at 19:28 UTC · Launch Successful Sputnik 8K74PS — Soviet Space Program, to Low Earth Orbit 1/5, Baikonur Cosmodrome, Republic of Kazakhstan The world's 1st orbital launch attempt, and 1st of 1957. https://www.youtube.com/watch?v=DTDb3eKpPiw Data: Launch Library 2, The Space Devs. Image via The Space Devs.