© 2026 KNAU Arizona Public Radio
Arizona Public Radio | Your Source for NPR News
Donate
Play Live Radio
Next Up:
0:00
0:00
0:00 0:00
Available On Air Stations
KNAG 90.3 FM Grand Canyon is temporarily off air due to suspected antenna damage. We are working with contractors to identify and fix the problem.

Arizona Public Radio continues to integrate new audio software while addressing remaining glitches. We appreciate your patience and support and will update when all issues are fully resolved.

Space Shuttle Structure

Published February 2, 2003 at 10:00 PM MST

NASA engineers and safety experts have continuously modified and upgraded the shuttle fleet over the years. The fleet has known weaknesses, and investigators will be looking very closely at these as they try to figure out what happened to Columbia as it re-entered Earth's atmosphere Feb. 1. NPR's Chris Joyce reports.

Copyright 2003 NPR