For 4.5 billion years, the Moon has been quietly keeping a record — and China's Chang'e-6 mission has finally given scientists the key to read both sides of it. By returning the first far-side lunar soil samples for laboratory analysis, researchers have confirmed that Earth's magnetosphere has long cast a protective shadow over the Moon's near side, slowing the solar wind that strikes it and leaving the far side exposed to the full, unfiltered force of the Sun. The two hemispheres of a single world have lived different lives, shaped by an invisible planetary shield, and the dust remembers ever