The new directive [PDF] reflects an unfolding reality at NASA. The US space agency's budget is unlikely to be as big as it was when NASA kicked off the Commercial Low Earth Orbit Destinations Program, ...

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The Viking 1 spacecraft arrived in orbit around Mars on June 19, 1976. The orbiter took images of the Martian surface that ...

The Apollo missions used Radioisotope Thermoelectric Generators (RTGs) to power experiments to be left on the lunar surface.