dr. richard zurek is the chief scientist for the mars program at nasa's jet propulsion laboratory. >> a lot of things have to happen right. right now we fly into the atmosphere, we have a heat shield that protects us, but we're also trying to slow down so we can land softly. we're talking about a very different scale of endeavor. we're landing a metric ton down on the planet today, we think for human missions to get stuff down on the surface that they can use, that they can be there for a long period of time, that means forty, fifty metric tons. that's a lot of material. today, we don't know how to land that. >> mars one has come under much critical fire for their project. primarily due to funding issues and for reports of recording the mission for a reality show. in march 2015, ceo bas lansdorp took to youtube to respond. >> they are currently selling the documentary series to an international broadcaster. there's no deal in place yet, but it's looking very promising, there's a lot of interest. at mars one we really value a good criticism about our mission because it helps us to improve ou