
Acting NASA Administrator Steve Jurczyk places a wreath at the Space Shuttle Challenger Memorial during a ceremony that was part…

NASA spacewalker Victor Glover works to ready the International Space station’s port-side truss structure for future solar array upgrades.

NASA spacewalker Victor Glover works to ready the International Space station’s port-side truss structure for future solar array upgrades.

NASA spacewalker Victor Glover works to ready the International Space station’s port-side truss structure for future solar array upgrades.

NASA spacewalker works to ready the International Space station’s port-side truss structure for future solar array upgrades.

NASA spacewalker Victor Glover works to ready the International Space station’s port-side truss structure for future solar array upgrades.

NASA spacewalker Victor Glover works to ready the International Space station’s port-side truss structure for future solar array upgrades.

NASA spacewalker Victor Glover works to ready the International Space station’s port-side truss structure for future solar array upgrades.

NASA spacewalkers (from left) Victor Glover and Michael Hopkins are suited up and ready for the year’s first spacewalk.