JSC2010-E-006713 (5 Jan. 2010) --- NASA astronauts Alan Poindexter (background), STS-131 commander; Clayton Anderson and Stephanie Wilson, both mission specialists, participate in an undocking timeline training session in the Guidance and Navigation Simulator in the Mission Simulation Development Facility at NASA's Johnson Space Center.
Photographer LAUREN HARNETT
Date January 5, 2010