This Sunday, CU Boulder will hold a memorial event for Dr. Chawla. Organizers will also honor the memory of Col. Ellison Onizuka, the CU astronaut who died in the Challenger explosion.

Thirty years ago on January 28, seven astronauts were killed when the Challenger ... videos several years after the shuttle disaster. Her lost lessons are now available on the Challenger Center ...

NASA's Apollo 1, Challenger and Columbia tragedies remind Andrew Allen of the science fiction movie "The Day the Earth Stood Still," where Americans later recall what they were doing and what they ...