This picture shows an artist's impression of the Curiosity rover. The machine's arm, which extends about two metres, can study rocks up close. A drill can collect sample material from the inside of rocks and a scoop can pick up samples of soil. The arm can sieve the samples and deliver fine powder to instruments inside the rover for thorough analysis. The mast, or rover's "head," rises to about 2.1 metres above ground level, about as tall as a basketball player. This mast supports two remote-sensing science instruments: the mast camera, or "eyes," for stereo colour viewing of surrounding terrain and material collected by the arm; and the chemistry and camera instrument, which uses a laser to vaporise a speck of material on rocks up to about seven metres away and determines what elements the rocks are made of.