Knowledge of the past and an optimistic view of the present give you great opportunities.

I believe that space travel will one day become as common as airline travel is today. I'm convinced, however, that the true future of space travel does not lie with government agencies -- NASA is still obsessed with the idea that the primary purpose of the space program is science -- but real progress will come from private companies competing to provide the ultimate adventure ride, and NASA will receive the trickle-down benefits.

The way I see it, what is going to come out of the moon activities is a respect for U.S. leadership.

The energy varies with the square of the velocity, so if you need five times the velocity, that's 25 times the energy.

I grew up in New Jersey and never went up the Statue of Liberty.

Heavy lifting doesn't need to be heavy spending if we do the job right.

There is very little doubt, in my mind, that what the next monumental achievement of humanity will be the first landing by an Earthling, a human being, on the planet Mars.