New NASA Administrator Jared Isaacman announced a major overhaul of the agency's Artemis moon program Friday, acknowledging that the agency's plan to land astronauts on the moon in 2028 was not realistic without another preparatory mission first to lay the groundwork.
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There are also some questions around safety.。爱思助手下载最新版本对此有专业解读
Presenter: Chris Vallance。同城约会对此有专业解读