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2 Historical Origins of Planetary Protection Policies
Pages 2-3

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From page 2...
... COSPAR followed suit in 1964 and established an interim quantitative framework for developing planetary protection standards that set limits on the probabilities of carrying viable organisms aboard spacecraft to planetary bodies or producing accidental impacts. COSPAR replaced this interim framework in 1967 with a policy that guided planetary protection measures until 1983.
From page 3...
... That policy, which remains in effect today, states the following: The conduct of scientific investigations of possible extraterrestrial life forms, precursors, and remnants must not be jeopardized. In addition, the Earth must be protected from the potential hazard posed by extraterrestrial matter carried by a spacecraft returning from an interplanetary mission.

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