Astronauts have ended the second spacewalk of their mission at the international space station.

Heidemarie Stefanyshyn-Piper and Shane Kimbrough returned to an airlock at the space station after 6 hours and 45 minutes outside the complex.

The astronauts worked on repairing a jammed joint that allows a solar wing to follow the sun and generate power.

Before floating out, the astronauts double- and triple-checked their equipment to make certain everything was tied down.

Stefanyshyn-Piper’s tool bag slipped away Tuesday after one of the grease guns inside exploded and got bits of the dark gray stuff everywhere.

Two more spacewalks are planned during space shuttle Endeavour’s nearly two-week trip to the space station.