CAPE CANAVERAL, Fla. (AP) — Shuttle Discovery's astronauts breezed through their third and final spacewalk Sunday, replacing an empty gas tank at the international space station and collecting a sample of dusty debris.

Spacewalkers Michael Fossum and Ronald Garan Jr. wrapped up their work so quickly that Mission Control threw in some extra chores.

The highlight of the 6 1/2-hour spacewalk, for Garan, was a long ride on the space station's robot arm that swung him 80 feet out from the orbiting complex.