It is human nature to explore the unknown. When children gazed at the moon half a century ago, they were eyeing somewhere they could never go. And there was a side of the moon that no human had ever seen, even with the help of telescopes. On January 3, 2019, the successful landing of China’s Chang’e-4 probe on the far side of the moon marked a significant step for human exploration of outer space and a pristine exhibition of human wisdom and cooperation. Humans have responsibility to explore and understand the world around us. When kids turn their heads to the moon tonight, the sphere will be closer to their hearts than ever before.