The essential point we want to make is that interstellar travel, far from being easy, presents problems for which we do not have valid solutions.

The known methods of producing anti-protons require, for their formation, millions of times the energy they will release when they contact protons.

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

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.

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.