Scientists analyzing lunar samples from China’s Chang’e-6 mission have uncovered evidence of a colossal ancient asteroid impact. Elevated levels of heavy potassium isotopes suggest extreme heating that drove lighter elements into space, potentially explaining why the Moon’s far side lacks dark volcanic plains seen on the near side.​Scientists analyzing lunar samples from China’s Chang’e-6 mission have uncovered evidence of a colossal ancient asteroid impact. Elevated levels of heavy potassium isotopes suggest extreme heating that drove lighter elements into space, potentially explaining why the Moon’s far side lacks dark volcanic plains seen on the near side.  ​ science