The Downlink • Mar 20, 2026 Builders and boulders Space Snapshot These X-ray computed tomography scans of samples from asteroid Bennu helped solve a mystery that puzzled NASA for years. When NASA's OSIRIS-REx spacecraft reached Bennu in 2018, scientists expected sandy surfaces. Earlier telescope observations had suggested Bennu's surface heated and cooled rapidly, like sand on a beach. Instead, th...