This test Vostok spacecraft was the fifth and last in a series of spacecraft designed as precursors to manned space flight. It carried a dummy astronaut and the dog Zvezdochka ("little star"), as well as the television system and other scientific apparatus. After one orbit, a successful recovery was made.
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Sputnik 2 erregte mit einer Startmasse über 500 kg ungläubiges Staunen der westliche Fachleute.
Sputnik 3 trug mehrere wissenschaftliche Messinstrumente in den Weltraum, welche den Strahlungsgürtel der Erde untersuchen sollten - was aber ebenfalls fehlschlug.
Sputnik 6 befand sich in einer Bahnhöhe zwischen 187,3 und 265 Kilometern und hatte eine Umlaufzeit von 88,6 Minuten.
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