NASA官员3月25日宣布,该局已选定了其“小行星转向任务”(ARM)的一项方案,将派无人探测器从较大的一颗小行星上提取一块巨砾。这项决定是在此前一天的ARM项目任务方案评审会议上做出的。NASA副局长莱特富特在一次电话会议上对记者表示,他之所以选择所谓的B方案,主要是因为该方案能在把什么样的物体拖回到月球轨道以供宇航员探访方面带来更多 NASA officials announced on March 25 that the agency has chosen a “Asteroid Steer” (ARM) program that will send an unmanned probe to extract a large piece of rock from a larger asteroid . This decision was made on the day before the ARM project mission program review meeting. NASA Assistant Secretary Letterlett told reporters in a conference call that the reason why he chose the so-called B scheme is mainly because of what kind of scheme the program can drag back to lunar orbit for astronauts to visit more many