PHOTOS: NASA's Darkest Moments

NASA marks anniversaries of Challenger, Columbia, Apollo 1 accidents.

PHOTOS: Challenger, Columbia, Apollo: NASA's Darkest Moments

Space Disasters
Space Disasters
Space Disasters
Space Disasters
Space Disasters
Space Disasters
Space Disasters
Space Disasters
Space Disasters
Space Disasters
Space Disasters
This is the cockpit of Apollo 1 after the fire that killed astronauts Grissom, White and Chaffee. Investigators concluded a short circuit started the fire, which spread quickly through the ship's oxygen-pressurized cabin. After the tragedy, Apollo was completely redesigned. (NASA)
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