Every moment is as real as every other. Every 'now,' when you say, 'This is the real moment,' is as real as every other 'now' - and therefore all the moments are just out there. Just as every location in space is out there, I think every moment in time is out there, too.

I think it's too fast to say that all sci-fi ultimately winds up having some place in science. On the other hand, imaginative minds working outside of science as storytellers certainly have come upon ideas that, with the passing decades, have either materialized of come close to materializing.

The pinpoints of starlight we see with the naked eye are photons that have been streaming toward us for a few years or a few thousand.

Our eyes only see the big dimensions, but beyond those there are others that escape detection because they are so small.

For most people, the major hurdle in grasping modern insights into the nature of the universe is that these developments are usually phrased using mathematics.

I've seen children's eyes light up when I tell them about black holes and the Big Bang.

When you know the answer you want, it is often all too easy to figure out a way of getting it.