Science Bizarre moon structures: How did they get there?

Planetary scientists once suspected that the vast depression on the moon was an impact crater caused by an asteroid collision. New analysis of data collected by NASA's GRAIL mission suggests otherwise.

By , Staff writer

Courtesy of NASA/Colorado School of Mines/MIT/JPL/Goddard Space Flight Center

Even though its been more than four decades since humans first set foot on the moon, Earth's lone natural satellite still holds many mysteries.