The Change four relay star, which was about to launch in May, was named magpie bridge at the opening ceremony of Chinas space day at the opening ceremony of the 24 day. The two small satellites, developed by Kazakhstan, were named Longjiang No. 1 and Longjiang two. It is understood that Change four, which is planned to be launched around the end of this year, will realize the first lunar landing detection of the moon, while Change four will provide lunar relaying support for Change four. Change four relay star will be launched early in May to establish Earth Moon communication. China plans to launch Change four lunar probe in the second half of this year, and for the first time, the soft landing of the lunar probe on the back of the moon. In April 22nd, academician Wu Weiren, the chief designer of the lunar exploration project, explained the plan that the lunar back exploration would not only help to explore the moon in an all-round way, but also to detect the signal of the cosmic origin in the quiet zone of the electromagnetic wave. Lunar exploration Engineer: Change four landing on the back of the moon like landing on Yun Guichuan.