Johnson Space center director Michael L. Coats, left, stands with Lorena Onizaka and Darien Onizuka-Morgan, the wife and daughter of space shuttle Challenger astronaut Ellison Onizuka, after placing ... more 
Johnson Space center director Michael L. Coats, left, stands with Lorena Onizaka and Darien Onizuka-Morgan, the wife and daughter of space shuttle Challenger astronaut Ellison Onizuka, after placing flowers on a memorial marker for Onizuka 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 1and space shuttles Challenger and Columbia. Friday, Jan. 28, will mark the 25th anniversary of the Challenger accident. less 
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Associated Press | Photo By Houston Chronicle, Smiley N. Pool
Thu, Jan 27, 2011 4:48 PM EST