"It's good to have a fear of heights. I mean, it's kind of crazy not to because if you just lean out a little bit and there's a gust of wind or somebody bumps you or something and you fall, you're splat."

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I think going into space would be like going deep into the ocean, like 5,000 meters down. When you go down that far, it's just awfully black. There's not much there except mud and some particles. I imagine space would be a similar thing. The only difference is you're hoping to bump into some sort of intelligent extraterritorial being.

— Ridley Scott