Discovery 's mission was to zap small Martian satellites on Saturday night . Scientists say it will be the first time such a powerful laser has been used on another planet . It will analyze ionized gas to identify chemical elements . Curiosity landed in Gale crater on August 30 ; scientists have been studying its systems .
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 .