Concerns have been raised that:
The United States National Space Science Data Center catalogued 157 spacecraft placed into orbit by launches which occurred in 1968.[1] The first crewed Apollo missions occurred in 1968. It was also the year in which Earth lifeforms first left low Earth orbit, during the successful Zond 5 mission to the Moon and the Zond 6 lunar mission which crashed upon return, and the year that humans first left low Earth orbit, during the successful Apollo 8 mission to the Moon.
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