Mercury Space Observatory (1964)

Piloted spacecraft differ from most other types of space vehicles in that they need to return precious cargo to Earth's surface. Beyond Apollo blogger David S. F. Portree describes how, a year after the last manned Mercury mission, a NASA engineer proposed that Mercury capsules be re-purposed to return a new precious cargo: photographic film containing high-resolution images of comets, stars, and galaxies.

Source: http://www.wired.com/wiredscience/2012/06/mercury-space-observatory-1964/

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