imran10,<br /><br />Considering that the person who made this statemont has absolutely NOTHING to do with manned spaceflight, being instead the lead man on the rover missions, I would take what he says with a large grain of salt. And he qualified his statement with the condition that sending humans to Mars became a 'primary priority.' Certainly, if we threw hundreds of billions of dollars at the problem, we could have a Martian surface manned expedition within that time frame. It would be about the equivialant of the Apollo program, only it would last twice as long, or longer.<br /><br />We may not even have humans on the MOON in 30 years, the way we are going about it. Without big Heavy-Lift Launch Vehicles, it is going to be very difficult to send people anywhere beyond Low Earth Orbit. Not impossible, mind you, just very difficult. Like, say, 20 launches of Delta Heavies to put all the required mass for a Lunar expedition in LEO.<br /><br />The Saturn 5 was just barely big enough to send twe men to the Moon and get them back. And they were traveling in the most minimal spacecraft we can imagine. How big of a rocket will we need to send 5 people to the surface of the Moon, and be able to return them? And provide them with the equipment to actually DO something while they are there? Or, are we going to have to develop a totally new kind of spacecraft, one which never operates in atmosphere? And a mission to Mars? Well, if you need a minivan to get to the Moon, you are going to need a semi (articulated lorrie) to go to Mars. <div class="Discussion_UserSignature"> The secret to peace of mind is a short attention span. </div>