More than 58 years have passed since Sputnik 1 became the first artificial satellite to orbit Earth. Launched by the Soviet Union on October 4, 1957, Sputnik 1 consisted of a 23-inch-diameter metal sphere with four radio antennas — that’s it.
Compared with the highly sophisticated satellites in orbit today, including the Hubble Space Telescope and the International Space Station, Sputnik 1 is not much to look at. But this satellite gave scientists critical information about Earth’s upper atmosphere that helped with the success of later launches.
Since that October day in 1957, space agencies and private companies around the read more >>>