It's been more than 40 years since rocks from the moon have come back to Earth. But in late November, a Chinese craft landed on the moon's surface--it's the country's first mission designed to retrieve samples of the moon's surface. The mission is called Chang'e-5, in honor of the moon goddess. NPR science correspondent Geoff Brumfiel tells us what the mission will tell us about the solar system, and how it foreshadows China's future ambitions on Earth and in space. Email us at shortwave@npr.org.