China plans to launch a relay satellite for next month's Moon probe, Chang & # 39; e-4, on Monday, May 21st.
The lunar probe Chang'e-4 will perform the first gentle landing on the other side of the moon. However, direct communication with the other side of the moon is not possible, which is one of the many challenges of the Moon's mission of the Chang & # 39; e-4 probe.
The relay satellite Queqiao will be responsible for the transmission of signals between both the earth station and the lander and rover Chang & # 39; e-4.
Relay satellites are communications satellites that provide data relay and monitoring services for spacecraft and can improve the efficiency and emergency safety of various satellites. They also enable the transmission of data from terrestrial and environmental satellites in real time.
The Chang & # 39; e-4 probe will also carry scientific payloads for four countries, including the Netherlands and Germany.