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What do you think of this. >> it's fantastic. a private space race is something that you couldn't have anticipated in the 60s. it's governments competing against each other. now you have these billionaires, self-proclaimed space geeks want to be the first to have the most powerful rockets to shoot it as far as possible. they're getting money from nasa and government contracts, but they're accelerating the space race faster than government s could. they're creating technology that is less expensive than what the government gave us. that means at some point it will translate to planes and cars a...

He's not struck fire with people. he's been overwhelmed in this tidal wave here. like some of the other people, he's fading. that's a fact. i did see him -- i don't get it. >> rand paul has die hard, comm committed libertarians who will stick with him and jeb bush has nothing like this. >> always a great conversation. thank you so much. reminder, cnn and facebook will be hosting the first democratic candidates debate tuesday, october 13th, in vegas. next, space geeks, nasa announcing a huge discovery. water on mars, what could this mean? signs of life potentially? also cnn sits down with b...

That means absolutely so much to mankind, doesn't it? >> it does, also to space geeks. it's already beaming back images of pluto. one astronomer calls it mind-blowing. the mission will complete when nasa calls the big classical solar system and they say the final moments can be dangerous. >> we've also been very honest, that we're flying into the unknown. this is the risk that you take with all kinds of exploration, and new horsesizons will be out of touch for those hours of approach. though i don't lose sleep over this the fact it tomorrow there's going to be an a little bit of drama. >> ther...

Nifty space background. we're watching. hello to my space geeks. i have to confess i'm so excited about this. i snow sanjay is too. moments from now, scott kelly due to blast off a board this russian rocket for a one year stay a board the national space station. this is the launch pad where we're moments from the launch. kelly's 342 days in space would be a u.s. record. the purpose is study long term effects living without gravity. zero gravity environment to prepare the crew to travel to mars. i've got sanjay gupta. we'll talk to him in a second. first, rachel crane setting up

Stuffing early because something is happening tomorrow that is more than 4.5 billion years in the making. it formed and is headed to the sun, and my fellow space geeks, listen closely. you may actually be able to see it. chad myers is up next with the details. car insurance rates side-by-side, so you get the same coverage, often for less. that's one smart board -- what else does it do, reverse gravity? [ laughs ] split atoms? [ flo chuckles ] [ whirring ] hey, how's that atom-splitting thing going? oh! a smarter way to shop around -- now that's progressive. call or click today.