it is a project called #dearmoon. take a listen. say, i'm veryan glad to be here. really excited. really honored. i really appreciate to be able to share this announcement with you and the people all over the world. emily: one man who knows a thing or two about space travel is a former nasa administrator who spoke to me from north carolina and shared his view of spacex and his own experience. >> it is a continuation of passenger flight. we have had an american company that had worked with the russians for a number of years, up to about 2009, and flew paying passengers, so we have had civilians fly before. nasa had the payload specialist program during the early days of shuttle. i look at this as a continuation. it is pretty big time when you do what spacex is about to do. emily: this trip is going to happen in 2023, but the rocket has yet to be built. what are the biggest challenges, concerns, and risks? >> the biggest challenges is the -- for anything that involves human spaceflight is the life-support system. elon talked a little bit about it yesterday in his ann

it is a project he is calling #dearmoon. take a listen. >> i choose to go to the moon.] >> yeah, finally i can pay. i am very glad to be here. i am really excited. really honored. really appreciate to be able to announcement with you and people all over the world. emily: one man who knows a thing about is retired astronaut charles bolden who spoke with me from north carolina. he shared his view on spacex and his own experience in space. charles: the biggest challenge and risk for anything that involves human spaceflight is the life support system. and elon musk talked a little bit about it in his announcement when he talked about closed loop on the water systems and others, when you are going somewhere as far as the moon. although it is only days, but you can't go in and take a couple of bottles of water along with them. they have got to be able to either recycle water or produce it on the shuttle. we used fuel cells with oxygen and hydrogen and one of the byproducts was water. so you are looking at closed loop life support systems for air, water, filtering waste. or at