Summary:
- NASA's OSIRIS-REx spacecraft studied the asteroid Bennu and found its surface to be much more rugged and rocky than expected.
- Researchers now believe Bennu's surface is covered in large boulders and rocks due to a process called "thermal fracturing," where temperature changes cause the rock to crack and break apart over time.
- This discovery helps scientists better understand the formation and evolution of asteroids, which can provide insights into the early solar system.