SOLAR SYSTEM

Detailed explanation-1: -On October 4, 1957, the Soviet Union launched the earth’s first artificial satellite, Sputnik I. The successful launch came as a shock to experts and citizens in the United States, who had hoped that the United States would accomplish this scientific advancement first.

Detailed explanation-2: -The USSR rocketed to the lead in the Cold War’s “Space Race” with the launch of Sputnik, a basketball-sized satellite that became the first manmade object to orbit the Earth. On October 4, 1957, the USSR launched Sputnik, the first artificial satellite to orbit Earth.

Detailed explanation-3: -The first artificial Earth satellite was Sputnik-1, launched by the USSR on a Semyorka rocket on October 4, 1957 (click here for views of the Vostok version [view 1] [view2] as exhibited in 1973 at VDNKh in Moscow). This rudimentary device only carried a radio transmitter, and it made no scientific measurements.

Detailed explanation-4: -It achieved an Earth orbit with an apogee (farthest point from Earth) of 940 km (584 miles) and a perigee (nearest point) of 230 km (143 miles), circling Earth every 96 minutes and remaining in orbit until January 4, 1958, when it fell back and burned in Earth’s atmosphere.

Detailed explanation-5: -Officially, Sputnik was launched to correspond with the International Geophysical Year, a solar period that the International Council of Scientific Unions declared would be ideal for the launching of artificial satellites to study Earth and the solar system.

Detailed explanation-6: -On October 4, 1957, the Soviet Union successfully launched Sputnik-1, the world’s first artificial satellite. Only about the size of a beach ball (22.8 inches or 58 cm. in diameter) and weighing 183.9 pounds (83.6 kg), it orbited the Earth in around 98 minutes.