Buzz Aldrin

Landing in the ocean and waiting for the Navy to come alongside and haul you out of the drink is what space capsules require. And after the capsule is recovered, it would take weeks for the ship to return to port.

What's aero braking? That's a way to use the gravity and upper atmosphere of Earth to sling shot a ship out either deeper into space, or slow it down to be 'captured' by Earth's gravity.

One of the major problems with long-term deep space human flight is the requirement for radiation shielding.

Space architectures capable of supporting a permanent human presence on Mars are extraordinarily complex, with many different interdependent systems.

I'm sure that there are places in the deserts in Australia that could be similar to where we might want to go on Mars.

Mars is much closer to the characteristics of Earth. It has a fall, winter, summer and spring. North Pole, South Pole, mountains and lots of ice. No one is going to live on Venus; no one is going to live on Jupiter.

Every couple of years, we could dispatch people from Earth to 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.

If you want poets in space, you'll have to wait.

Everyone who's been in space would, I'm sure, welcome the opportunity for a return to the exhilarating experiences there.

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

In space, you don't get that much noise. Noise doesn't propagate in a vacuum.