Space missions need to have a defensive component or economic benefit. With economic returns often uncertain, space programmes have tended to be led by governments, because only they can invest in programmes that have tended to be led by governments, because only they can invest in programmes that have a long-term pay-off, whether economic or geopolitical. When it comes to saving humanity from an asteroid impact, Tyson stressed that rather than establishing colonies in space, we would be better to try to deflect the asteroid. From World Government Summit.
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