Doppler Effect - Information Derived from It / Description of Sputniks 1 and 2 / Sputnik 1, Alone / Sputnik 1, Showing Doppler Effect
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Doppler Effect - Information Derived from It / Description of Sputniks 1 and 2 / Sputnik 1, Alone / Sputnik 1, Showing Doppler Effect