Even though 12 men have previously set foot on the Moon, space is one of the most exciting things in the universe, and we still know very little about it. Even though the last manned lunar trip took place in 1972, many unmanned missions are still being carried out today. A strange discovery that seemed entirely out of place perplexed many experts in China’s Chang’e-4 during a recent lunar exploration of the far side of the Moon, where humans have never set foot.