The crew of Space Shuttle Columbia's mission STS-107 pose for the traditional crew portrait. Seated in front are astronauts Rick D. Husband (L), mission commander; Kalpana Chawla, mission specialist; and William C. McCool, pilot. Standing are (L to R) astronauts David M. Brown, Laurel B. Clark, and Michael P. Anderson, all mission specialists; and Ilan Ramon, payload specialist representing the Israeli Space Agency.
- [NASA/Getty Images]

Space Shuttle Columbia lifts off from launch pad 39-A at the Kennedy Space Center in Cape Canaveral on Jan. 16, 2003.
- [Matt Stroshane/Getty Images]

In this image from video, an object is visible falling from Columbia during liftoff.
- [NASA-TV/Getty Images]

Astronaut Kalpana Chawla, STS-107 mission specialist, looks over a procedures checklist in the SPACEHAB Research Double Module while flying aboard Columbia on Jan. 27, 2003.
- [NASA/Getty Images]

Israeli Prime Minister Ariel Sharon talks with Israeli astronaut Ilan Ramon (L) during an in-flight conference broadcast live via NASA TV on Jan. 21, 2003. Sitting in with Ramon are mission specialist Laurel Clark (C) and Shuttle Commander Rick Husband.
- [Avi Ohayon/GPO/Getty Images]

The STS-107 crewmembers strike a flying pose for their traditional in-flight crew portrait in the SPACEHAB Research Double Module.
- [NASA/Getty Images]

Debris from Columbia is shown falling in this image from a US Army Apache helicopter military video of the shuttle breaking up in flight on Feb. 1.
- [/Getty Images]

A piece of Columbia in the middle of a pasture near San Augustine, Texas, on Feb. 1, 2003.
- [Paul Buck/AFP/Getty Images]

NASA Project Manager Fred Ahmay holds a biological container in which C. elegans nemotodes, or round worms, were found among wreckage from Columbia in late April 2003.
- [Volker Kern/NASA/Getty Images]

An overview of the floor of the RLV Hangar at Kennedy Space Center, Fla., where debris from the Columbia disaster was been collected, on April 24, 2003.
- [NASA/Getty Images]

G. Scott Hubbard, a member of the Columbia Accident Investigation Board, during a press conference in Washington, DC, on July 11, 2003.
- [Paul J. RICHARDS/AFP/Getty Images]

The wife of space shuttle Columbia Commander Rick Husband, Evelyn Husband (L), and NASA Associate Administrator Bill Readdy (R) place a wreath at the Astronaut Memorial at Kennedy Space Center, Fla., during a dedication adding the Columbia crew.
- [BRUCE WEAVER/AFP/Getty Images]

Copies of a comic book biography on late astronaut Kalpana Chawla at a bookstore in Mumbai on Sept. 4, 2005.
- [Indranil MUKHERJEE/AFP/Getty Images]