000B: How do you power a spacecraft?

Update: 2020-11-09

Description

The only external source of energy available to a spacecraft with reasonable flight heritage is solar radiation; the use of unfolding solar arrays is common; in a fuel cell, hydrogen and oxygen, or a similar combination, are combined to produce electricity and water; Radioisotope Thermoelectric Generators, or RTGs, convert heat released from the decay of radioactive material into electricity.

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000F: What has space ever done for me?

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