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

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.

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.

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

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

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.