When did Neil Armstrong land on the Moon?, What is the main problem of the ISS?, Since when have astronauts been living continuously on the ISS?, What does Stephen Hawking say about space colonisation?, What famous phrase did Neil Armstrong say?, What inspired people to dream about space colonisation?, What important resource was found on the Moon in 2009?, Why is living on the Moon difficult?, How long would it take to reach Alpha Centauri with Voyager 1?, Why is space colonisation expensive?

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