Astronaut floating with the blue Earth in the background. Hubble and one of its solar arrays is visible, as is the space shuttle at the bottom of the image.

Hubble astronaut Kathryn Thornton spacewalking during Servicing Mission 1

Kathryn C. Thornton, on the end of the Space Shuttle Endeavour's Remote Manipulator System arm, hovers over equipment for servicing the Hubble Space Telescope during Servicing Mission 1.

Credits: NASA