Earth's Magnetosphere Acts as 'Speed Governor' for Solar Wind at Moon

From the ancient dust of the Moon's far side, carried home by China's Chang'e-6 mission, comes quiet confirmation of something long theorized but never held in hand: Earth's magnetic field reaches across nearly 400,000 kilometers of space to soften the solar wind's blow on the Moon's near side. Noble gases trapped in lunar soil tell the story in chemistry — a hemisphere bathed in Earth's protective shadow, and one left fully exposed to the Sun's relentless breath. This discovery, emerging from samples collected in late 2024 and analyzed by researchers at the Chinese Academy of Sciences, deepen