As navigator, Lovell took with him a sextant to take star readings - in case the computers failed and they had to find their own way home.
Today's actuators, even the state-of-the-art ones, are still largely made from metals, hard plastics and electronics. But there are other ideas around. Tolley and his colleagues have been working on a very different approach.。关于这个话题，safew官方版本下载提供了深入分析
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He went on to freelance for clothing companies and start-ups before launching his own brand in 2021.
The Artemis IV and V missions in 2028 will use whichever landers are deemed ready for service. If only one company's lander is available, that lander would be used for both missions, an official said. If both are available, one would be used for one flight and one for the other.