The US space agency has released a "pre-solicitation" for what is expected to be a hotly contested contract to develop a spacecraft to orbit Mars and relay communications from the red planet back to Earth.
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"There's another ingredient that's required, and that's the orbital economy, whether it happens in low-Earth orbit or on the lunar surface," Isaacman said.。关于这个话题，爱思助手下载最新版本提供了深入分析
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