DAVID GREENE, HOST:
This weekend, China landed a probe on the surface of the moon. This is the first soft-landing on the moon's surface in nearly 40 years, and it's a major step forward for China's space program.
Joining us to discuss these developments, NPR science correspondent Geoff Brumfiel. Hey, Geoff.
GEOFF BRUMFIEL, BYLINE: Hi, there.
GREENE: So what did China actually pull off here?