Aside from communications satellites, space is devoid of industry.

The amazing thing is that every atom in your body came from a star that exploded.

Keeping religion immune from criticism is both unwarranted and dangerous.

Empty space is a boiling, bubbling brew of virtual particles that pop in and out of existence in a time scale so short that you can't even measure them.

There is a maxim about the universe which I always tell my students: That which is not explicitly forbidden is guaranteed to occur.

Metaphysical speculation is independent of the physical validity of the Big Bang itself and is irrelevant to our understanding of it.

A truly open mind means forcing our imaginations to conform to the evidence of reality, and not vice versa.