From the distance of the moon, Earth was four times the size of a full moon seen from Earth. It was a brilliant jewel in the black velvet sky.

Astronauts are not superhuman. They lead ordinary lives and have varied personalities.

Like actors and writers who are on and off again in terms of employment, I had a very unstructured life.

The best way to study Mars is with two hands, eyes and ears of a geologist, first at a moon orbiting Mars... and then on the surface.

Don't waste your time on beaming people up or down. Instead, consider gravity waves as advanced physics of the universe that could be used to travel interstellar distances.

We need to have people up there who can communicate what it feels like, not just pilots and engineers.

Only a large-volume market like space travel can attack the barrier of high costs.