By
Sarah Kaplan and
Gerry Shih
January 3 at 12:13 AM
“The far side of the moon is a rare quiet place that is free from interference of radio signals from Earth,” mission spokesman Yu Guobin said. “This probe can fill the gap of low-frequency observation in radio astronomy and will provide important information for studying the origin of stars and nebula evolution.”
Though China, the United States and Russia have operated robotic spacecraft on the moon before, Chang’e 4 is the first to land on the side of the satellite that always faces away from the Earth. The geology on this side of the moon is distinctive, with more craters and less evidence of volcanic activity. But it’s difficult to explore, because scientists on Earth can’t communicate via direct radio signal with spacecraft in this remote region — something China’s relay satellite has solved.