This animated gif is compiled of images from Phoenix's Stereo Surface Imager (SSI) taken on Sol 3. It shows the stair-step motion used to unstow the arm from a protective covering called the biobarrier. The last two moves allow the arm to stand straight up.

The Phoenix Mission is led by the University of Arizona, Tucson, on behalf of NASA. Project management of the mission is by NASA's Jet Propulsion Laboratory, Pasadena, Calif. Spacecraft development is by Lockheed Martin Space Systems, Denver.