derek pitts of the franklin institute on how the project is -- do you know how it's doing? it is really reigniting the country's speciinterest in the program. >>> share your thoughts on facebook and on twitter using the hash tag edshow. >>> welcome back. good to have you with us tonight. mitt romney is fighting back against a pro-obama super pac ad featuring steelworker joe sopic. today his campaign is hitting back at the president with an ad of its own. >> what does it say about a president's character when his campaign tries to use the tragedy of a woman's death for political gain? >> the romney camp can try and attack the president but can't deny the facts. the decision by bain capital to lay off folks like joe sopic had consequences. in his case, he lost his health insurance and his cancer-stricken wife didn't have a fighting chance. joe soptic is not alone. when you don't have hit and run, you're playing russian roulette with your future, no question about it. that's what americans grab right now. you don't have to take my word for it. just ask romney campaign spokeswo

derek pitts, from franklin institute planetarium. tom, we were talking about this yesterday and we were oh so optimistic and hopeful that it would succeed and did. kind of makes you proud to be an american. what a technological achievement here, a tribute to american industry justness and ingenuity, isn't it? >> a product of 10 years of intense design work and engineering to make the spacecraft survive. this is nail-biting landing on mars. con graltlations to the jet propulsion team and nasa. we'll have five years of amazing results coming from mars. it is the prelude to the next big step in mars exploration which is bringing samples back from the red planet. learning about possible life there and paving the way for human explorers. gregg: derek, when tom and i were covering yesterday, we got e-mails from people saying billions spent on this is a waste. there are no martians on mars. that is not the point. the point is we're not looking for existing life there but the conditions that may have existed for organic life at one time? >>