Which key characteristic defined the selection criteria for the cosmonauts in the 'First Twelve' group, likely due to spacecraft limitations?

Answer

A height restriction of less than 5 feet 7 inches tall.

The text states that the final group selected were all under 5 feet 7 inches tall, a height restriction likely enforced due to the very tight physical confines of the Vostok capsule.

Which key characteristic defined the selection criteria for the cosmonauts in the 'First Twelve' group, likely due to spacecraft limitations?

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