my focus has been on the use of that. >> hi, this question might have been more appropriate for jim garvinnd i didn't get a chance to ask him. >> and jim gives a much more engaging answer but i'll try. go ahead. >> we saw the movie last night about the rovers and how, you know, the life span is indefinite and how much they've accomplished. there's been a lot of talk about the problems with the msl and how that's going. have they considered, you know, instead of spending all this money developing a new probe, to answer questions at one site, spending an equivalent amount of money and sending out a bunch of rovers that we knowow to build to a bunch of different sites and answer a lot of questions? >> i know that a lot of scientists and many of those working and engineers who are working on the mars exploration rover tm feel exactly that. why didn't we just build more of them and go to different places? part of the answer is bound up in the philosophy of developing more and more technology that can take us upo the point of leading to mars sample return and building more vehicles and always bu

keith garvin joins us from nats stadium with the latest on this story. good news down there, keith. >> reporter: that's right, jim. nats take on colorado in an hour and a half. big news taking place off the field with the signing of pitching sensation steven strasburg. it won't down to the wire last night. nats fans were paying attention. loads oftal sxept now loads of cash. the nats newest pitcher. the numbers, 6-5, 216 pounds. thro a fastball 102 miles per hour. and last night the $t 21-year-old sign ad contract worth $15.67 million over four years. >> lot of money. lot of money for an unknown talent. played well in college. i think if he pans out in the long run, it is probably -- would pay off. $15 million. lot of money for a young talent that hasn't played one day in the minor leagues. >> reporter: strasburg wowed scouts for years. what about nats fans? is he worth it? >> one question is whether he can throw 102 in the game. the question major league hitters can hit a pitch with all that much problem. we will see. >> reporter: for the sake of the team, for the sake of the fans, they are hoping strasburg's ar