Discovery 's mission was to zap small Martian satellites on Saturday night . It will analyze ionized gas to identify chemical elements . Curiosity landed in Gale crater on August 30 ; scientists have been studying its systems .
Rover 's ChemCam was to zap small Martian rock on Saturday night . It will analyze ionized gas to identify chemical elements . Curiosity landed in Gale Crater on August 6 ; scientists have been checking its systems .