My goal is simple. It is a complete understanding of the universe, why it is as it is and why it exists at all.

Maxwell is the physicist's physicist.

When I was first diagnosed with ALS, I was given two years to live. Now 45 years later, I am doing pretty well.

If we ever do find a complete theory of the universe, it would be a great triumph of human reason but it wouldn't leave much for us to do. We need an intellectual challenge.

We explore because we are human and we want to know. I hope that Pluto will help us on that journey.

Time and space are finite in extent, but they don't have any boundary or edge. They would be like the surface of the earth, but with two more dimensions.

A picture is worth a thousand words...and uses up a thousand times the memory.