Barney Oliver

In the past, on Earth, it has largely been to exploit foreign resources and to expand the domestic territory. ”

The sun and its retinue of planets drift as a group through the vast gulfs of space that separate the stars. ”

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. ”

Present annual world energy consumption is about equal to the annihilation energy of 4 tons of matter. ”

Antimatter is not a source of energy for us, it's a method of storing energy, compact but inefficient. ”

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. ”