] Space shuttle Columbia's astronauts briefly interrupted
] their science work on the 17th anniversary of the
] Challenger disaster to remember their fallen comrades.
]
] NASA's work force, in orbit and on Earth, observed a
] moment of silence Tuesday at the exact time that
] Challenger exploded in the sky Jan. 28, 1986. They
] honored not only on the seven Challenger astronauts, but
] also the three who were killed by a fire in their Apollo
] spacecraft at the pad Jan. 27, 1967.