john grotzinger, a professor of technology at caltech, and the scientists for the mission. after that update, we will move on to our witness panel, where we will examine the progress of nasa's exploration program under the nasa authorization bill that was passed in 2010, particularly as it relates to a future human mission to mars. our witnesses include dr. steven squires, chairman of the nasa advisory council, dr. charles kennel, chair of the national academy space studies board, and director and distinguished professor emeritus at scripps institute of oceanography, and mr. jim maser, president of pratt and whitney, a company that does a lot of things, but also specializes in rocket technologies. i want to welcome all of you here today. would you like to introduce your team? >> certainly. i will introduce to my left, dr. li, and work from there. first of all, thank you very much, senator nelson, for inviting us here. this is spectacular results. my hopes and dreams for this mission were that even just the seven minutes of terror leading up to a successful landing would be