Sputnik 2 (Russian: Спутник-2, Satellite 2) was the second spacecraft launched into Earth orbit, on November 3, 1957, and the first to carry a living animal, a dog named Laika. Sputnik 2 was a 4-meter (13 foot) high cone-shaped capsule with a base diameter of 2 meters (6.6 feet). It contained several compartments for radio transmitters, a telemetry system, a programming unit, a regeneration and temperature control system for the cabin, and scientific instruments. A separate sealed cabin contained the dog Laika.Engineering and biological data were transmitted using the Tral D telemetry system, which would transmit data to Earth for a 15 minute period during each orbit. Two photometers were on board for measuring solar radiation (ultraviolet and x-ray emissions) and cosmic rays. Sputnik 2 did not contain a television camera; TV images of dogs on Sputnik 5 are commonly misidentified as Laika. Information provided by Wikipedia http://en.wikipedia.org/wiki/Sputnik_2
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