Search Continues for Secret Stamp Honoring John Glenn’s Historic Spaceflight (SPACE.com)

SPACE.com - Fifty years ago today (Feb. 20), John Glenn, the first American to orbit the Earth, relied on ground stations located across the planet to communicate with his control team. But after his Mercury spacecraft, Friendship 7, safely splashed down, it was another type of station that took over tracking his historic mission: U.S. post offices.

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