Unexplained 'gel like' substance with 'unusual colour' FOUND on Moon's dark side Yutu-2, the autonomous rover launched from China's Chang’e-4, has sent back photographs of a bizarre ‘gel like’ substance on the surface of the Moon during its exploration of the rarely-photographed far side. https://www.dailystar.co.uk/news/weird-news/unexplained-gel-like-substance-unusual-19112236