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Space travel is vital to the eventual survival of the human species. We need to invest in it, it's just that simple.

We can live on this planet for another 200 years or so, but eventually we're going to need to be able to diversify our population to other places to ensure singular events (like an asteroid smashing into earth, some type of disease, or a nuclear war) doesn't wipe out civilization.

We're not meant to stay here forever, probably some portion of someone's grandkids or great grandkids in this very thread will be born outside of Earth. So we're only 2-3 generations away IMO.