A hybrid human-robot mission to investigate an asteroid affords a realistic opportunity to demonstrate new technological capabilities for future deep-space travel and to test spacecraft for long-duration spaceflight.

There were about six years when there was not one American who went into space. We shouldn't do that again.

What comes after the moon? I think you can guess: Mars.

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.

I think humans will reach Mars, and I would like to see it happen in my lifetime.

The first human beings to land on Mars should not come back to Earth. They should be the beginning of a build-up of a colony/settlement, I call it a 'permanence'.

I don't watch 'American Idol,' but I wouldn't call it 'undignified.'