The image was sent back via the relay satellite Queqiao, which was operating around the second Lagrangian point of the earth-moon system, about 455,000 km from the earth, where it can see both the earth and the moon’s far side.

©China National Space Agency

CAS news release, January 11, 2019

According to WU Yanhua, deputy director of the China National Space Administration (CNSA), the cost of the Chang’e-4 mission is equivalent to that of constructing a one-km-long subway tunnel.

China’s investment in lunar and deep space exploration is appropriate to the overall level of the national economic and social development, Wu said.

As a big country, China should make contributions to exploring the mystery of the universe and benefiting human society, Wu said.

CAS news release, January 14, 2018