Something will happen to Earth eventually, it’s just a question of time. Eventually the sun will expand and destroy all life on Earth, so we do need … - Elon Musk

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Something will happen to Earth eventually, it’s just a question of time. Eventually the sun will expand and destroy all life on Earth, so we do need to move at some point, or at least be a multi-planet species. [...] You have to ask the question: do we want to be a space-flying civilisation and a multi-planet species or not? [...] It's a question of what percentage of resources should we devote to such an endeavour? I think if you say 1 per cent of resources, that's probably a reasonable amount.