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"Mars is the only place in the solar system where it's possible for life to become multi-planetarian."
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Personal Development
"A hole is a space where everything has been moved out so that opportunity has space to move in."
Author Name
Personal Development
"Land on Mars, a round-trip ticket - half a million dollars. It can be done."
Author Name
Personal Development
"Become aware of the physical distance and spatial orientation that you experience while in the company of others. Being empathetic and sensitive to a person's physical comfort zone can have a huge effect on the way in which you are received and perceived."
Author Name
Personal Development
"Proxemics is the study of human use of space and the effects that population density has on behavior, social interaction, and communication. Imagine invisible bubbles around every person that provides each of us with comfort zones for social engagement and interaction."
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Personal Development
"When your out of space, your out of place at the same time."
Author Name
Personal Development
"We are aware only of the empty space in the forest, which only yesterday was filled with trees."
Author Name
Personal Development
"It would take six months to get to Mars if you go there slowly, with optimal energy cost. Then it would take eighteen months for the planets to realign. Then it would take six months to get back, though I can see getting the travel time down to three months pretty quickly if America has the will."
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Personal Development
"The revolutionary breakthrough will come with rockets that are fully and rapidly reusable. We will never conquer Mars unless we do that. It'll be too expensive. The American colonies would never have been pioneered if the ships that crossed the ocean hadn't been reusable."
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Personal Development
"I think we are at the dawn of a new era in commercial space exploration."
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Personal Development
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"It would be a pity if, frustrated by the price of travel, we elected to become a society that never made contact, that never gave SETI a fair chance."
Society
"Antimatter is not a source of energy for us, it's a method of storing energy, compact but inefficient."
Energy
"If interstellar travel is as time- or energy- demanding as the above figures indicate, it is far from obvious what the motive for colonization might be."
Travel
"Above all, I would not expect a wise race, at great expense, to set loose an army of self-replicating robots."
Army
"No one can deny the excitement of visiting another world."
Excitement
"Years of science fiction have produced a mindset that it is human destiny to expand from Earth, to the Moon, to Mars, to the stars."
Science
"In the past, on Earth, it has largely been to exploit foreign resources and to expand the domestic territory."
Earth
"Present annual world energy consumption is about equal to the annihilation energy of 4 tons of matter."
Energy
"The sun and its retinue of planets drift as a group through the vast gulfs of space that separate the stars."
Space
"The factor most ignored in discussing interstellar flight is the kinetic energy that must be invested in the ship to make its tons of matter move at a substantial fraction of the speed of light."
Energy
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