"There are roles I want that my agency might not want me to do because of the subject matter or whatever. Or there are roles that people won't bring to me because they don't think I'll do it. And that is a big strain because an actor wants to act"

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Perhaps the best motivation for going to Mars is political. It is obvious that no single nation currently has either the will or the resources to do it alone, but a consortium of nations and space agencies could achieve it within 20 years.

— Paul Davies