guest Moderator 管理成员 注册 2002-10-07 消息 402,244 荣誉分数 76 声望点数 0 2019-08-07 #1 Debris left over from launches and defunct satellites poses a serious risk to astronauts and equipment in orbit, and now the federal government is looking for viable ways to clean it up. 查看原文...
Debris left over from launches and defunct satellites poses a serious risk to astronauts and equipment in orbit, and now the federal government is looking for viable ways to clean it up. 查看原文...
