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These data would be valuable in the creation of future artificial satellites; a system of ground stations was to be developed to collect data transmitted by the satellite, observe the satellite's orbit, and transmit commands to the satellite. Purser, who developed the Little Joe rocket used for unmanned tests of the Mercury capsules, discusses his experience after the launch of Sputnik. In October 1954, the council adopted a resolution calling for artificial satellites to be launched during the IGY to map the Earth’s surface. The world’s first artificial satellite was about the size of a beach ball (58 cm or 22.8 inches in diameter), weighed only 83.6 kg or 183.9 pounds, and took about 98 minutes to orbit Earth on its elliptical path. It was an uncrewed metal sphere carrying batteries, radio transmitters and equipment to monitor its internal condition. NASA lists five mission objectives, covering launch, atmospheric density, tracking, radio propagation and pressurization.
The signal's timing could convey changes in the satellite's internal condition. The later Soviet robotic missions carried increasingly specialized instruments to the Moon, Venus and Mars. This was a modest instrument package compared with later scientific satellites. Monitoring conditions inside the sphere tested whether the pressurized spacecraft remained intact. Changes in its orbit could reveal atmospheric drag, while reception of its radio signals helped researchers study propagation through the atmosphere. The immediate task was to demonstrate orbital launch and radio tracking.
The sphere-shaped Vanguard II satellite reflects the scene in this photo from the preparations for its launch in 1959. This satellite carried a small scientific payload that showed the existence of the magnetic radiation belts around thunder empire pokies the Earth, named after principal investigator James Van Allen. In addition, the public feared that the Soviets’ ability to launch satellites also translated into the capability to launch ballistic missiles that could carry nuclear weapons to the U.S. Scientists knew that solar activity would be at a high point during that time. Sputnik 1 demonstrated that a human-made object could be placed in Earth orbit and tracked by radio.
Observation Complex
Two of these batteries powered the radio transmitter and one powered the temperature regulation system. The satellite carried two pairs of antennas designed by the Antenna Laboratory of OKB-1, led by Mikhail V. Krayushkin. The hemispheres were 2 mm thick, and were covered with a highly polished 1 mm-thick heat shield made of an aluminium–magnesium–titanium alloy, AMG6T. The satellite was a 585-millimetre (23.0 in) diameter sphere, assembled from two hemispheres that were hermetically sealed with O-rings and connected by 36 bolts. R-7 test launches demonstrated that the tracking cameras were only good up to an altitude of 200 km (120 mi), but radar could track it for almost 500 km (310 mi).
