Johnson Space center director Michael L. Coats places a rose on a marker for space shuttle Columbia astronaut Ilan Ramon in the Astronaut Memorial Tree Grove during the annual National Day of Remembrance ceremony at the Johnson Space Center on Thursday, Jan. 27, 2011, in Houston. NASA holds the agency-wide Day of Remembrance every January to honor the fallen crews of Apollo 1 and space shuttles Challenger and Columbia.  Friday, Jan. 28, will mark the 25th anniversary of the Challenger accident. (AP Photo/Houston Chronicle, Smiley N. Pool)

Johnson Space center director Michael L. Coats places a rose on a marker for space shuttle Columbia astronaut Ilan Ramon in the Astronaut Memorial Tree Grove during the annual National Day of Remembrance ceremony at the Johnson Space Center on Thursday, Jan. 27, 2011, in Houston. NASA holds the agency-wide Day of Remembrance every January to honor the fallen crews of Apollo 1 and space shuttles Challenger and Columbia. Friday, Jan. 28, will mark the 25th anniversary of the Challenger accident. (AP Photo/Houston Chronicle, Smiley N. Pool)

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