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The microgravity or the very, very low amount of gravity that we have up in space forces some changes in different processes. It forces changes in us as human beings.

I think that witnessing ecological problems visible from space is one of the new and essential roles of astronauts.

The workouts have positively impacted the astronauts' bones and muscles, and they are coming back in really good shape. But some are losing bone and muscle but not as much as we saw in the early days.

If we go into space, we need enhancements that handle radiation and osteoporosis... or else we're dead. So what seems like an enhancement in one generation becomes life and death in another generation.

I think it's going to be a very important, unique data set in terms of measuring the behavior of your lower body in space and trying to figure out what we can do to preserve bone and muscle density.

Even if 'going retrograde' or 'moving into Aquarius' were real phenomena, something that planets actually do, what influence could they possibly have on human events? A planet is so far away that its gravitational pull on a new-born baby would be swamped by the gravitational pull of the doctor's paunch.

Evolution doesn't care whether you believe in it or not, no more than gravity does. I want to rekindle excitement over what we've achieved as a species with the space program. We can't afford to regress back to the days of superstition.

We want to make sure we get living astronauts to the surface of Mars.

By venturing into space, we improve life for everyone here on Earth - scientific advances and innovations that come from this kind of research create products we use in our daily lives.

I am excited to think that the development of commercial capabilities to send humans into low Earth orbit will likely result in so many more Earthlings being able to experience the transformative power of space flight.