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The images of Earth's delicate biosphere, contrasting with the sterile moonscape where the astronauts left their footsteps, have become iconic for environmentalists: these may indeed be the Apollo programme's most enduring legacy.

We are going to learn how to relate to the Earth and our own natural environment here by looking seriously at space colony ecologies.

Development of space will improve life on Earth. Access to space is important for agriculture, humanitarian efforts, communications, and navigation.

The quicker we humans learn that saving open space and wildlife is critical to our welfare and quality of life, maybe we'll start thinking of doing something about it.

The ability of the humans to not only function in space but be very functional when they arrive at their destination, those are the kinds of things we're learning from the science. Fuel transfer technologies and all the things we can learn about the space environment are all valuable to us for pressing on out.

When we meet people who are astronauts or deal in astronomy, it's always really fascinating.

It is foolish to claim, as some do, that emigration into space offers a long-term escape from Earth's problems. Nowhere in our solar system offers an environment even as clement as the Antarctic or the top of Everest.

If I hadn't been inside of Biosphere 2 and really lived a biological life-support system, I definitely would not be involved in life-support systems for space.

The government will see that human spaceflight is useful - for science and the economy - and inspirational.

I've been approached to do some things with astronauts and the preparation that astronauts go through.