一、概述拉格朗日点2011年6月9日16时50分05秒,嫦娥二号卫星飞离月球轨道,飞向日一地系统的“第二拉格朗日点”附近继续进行探测之旅,此次飞行距离150万公里,预计85天后到达.嫦娥二号因此成为我国航天测控史上测控距离最远的一颗卫星,并迈开了中国深空探测的第一步. First, an overview of Lagrange points At 09:20 on June 9, 2011 at 16:50:05, Chang’e II orbital from the lunar orbit, fly to the system of “second Lagrange point” near to continue For the exploration trip, the flight distance 1.5 million km, is expected to arrive after 85. Chang’e II therefore became China’s space flight monitoring and control of the longest distance in the history of a satellite, and took the first step in China’s deep space exploration.