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麦克唐纳天文台每分钟发送20个5焦耳的红宝石激光脉冲,在1月25日收到了法国空间局制造的、和苏联的飞行器月球车Ⅱ号一起放在月球Le Monnier环形山上的向后反射器所反射回来的回波。数据表明
The MacDonald Observatory sent 20 joules of 5 joules of ruby laser pulses per minute and received a retroreflector made by the French space agency on January 25 in conjunction with the Soviet aircraft rover No.2 on the lunar Le Monnier crater Echoes reflected back. as shown by data