SpaceX billionaire Elon Musk may have his heart set on building a city on Mars, but Amazon billionaire Jeff Bezos' space vision looks closer to home. He's gazing at the moon.

"I think we should build a permanent human settlement on one of the poles of the moon," Bezos said today during a Q&A with kids at Seattle's Museum of Flight. "It's time to go back to the moon, but this time to stay."

Bezos has talked about moon missions before, and he's even told NASA that his Blue Origin space venture could make Amazon-like deliveries to the moon, as part of a program called Blue Moon.

Today he went into more detail about his space aspirations when students asked him questions at the Museum of Flight's "Apollo" exhibit. Bezos' backdrop for the event included the decades-old pieces of Saturn V rocket engines that he arranged to have recovered from the Atlantic Ocean, plus an intact, never-flown engine of the same type.

Bezos said his dreams of spaceflight were fostered at the age of 5 when he watched NASA astronaut Neil Armstrong take humanity's first steps on the moon in 1969. Now he's able to follow through on those dreams – in large part because of the success of Amazon, the online retail company he founded in 1994.

A couple of months ago, Bezos acknowledged that he's funding Blue Origin to the tune of a billion dollars a year, fueled by his sales of Amazon stock.