Kosmos 482, which launched in 1972 on a mission to Venus, never made it out of Earth's orbit and instead broke into four pieces that have been circling the planet for more than five decades.
Amanda Blacklock is president of the Selkirk Musical Theatre Group
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it is worth optimising.
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It was not supposed to be used until they got to the Moon. It had no heat shield, so could not be used to re-enter the Earth's atmosphere. But it could keep them alive until they got there.