Tracks made by Yutu-2 while navigating hazards during lunar day 8, which occurred during late July and early August 2019.(Image: © China Lunar Exploration Project)

Back n July 2019, China’s Chang’e-4 lunar rover discovered an unusually colored, ‘gel-like’ substance during its exploration activities on the far side of the moon.

Yutu-2 found a strangely-colored substance in a crater on the far side of the moon. (Image credit: China Lunar Exploration Project

The far side of the moon is quite different from the side we’re used to seeing from Earth, and scientists don’t understand how those differences arose.


Chang’e 4 is a robotic spacecraft mission, part of the second phase of the Chinese Lunar Exploration Program. It achieved humanity’s first soft landing on the far side of the Moon, on 3 January 2019.