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

Above all, I would not expect a wise race, at great expense, to set loose an army of self-replicating robots.

No one can deny the excitement of visiting another world.

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

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.

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.