Soon we may be off to an asteroid
本文作者： 21ST
NASA (美国国家航空航天局) scientists are making plans to visit an asteroid (小行星) before 2025. It will be part of a test run for technologies (科技) needed for a Mars mission (任务). Sending astronauts to an asteroid could also help scientists plan for ways to protect Earth if an asteroid hit it. |  |
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