Do we need to go into space?

An article in Cosmos argues that we need to go into space. I sort of agree with the points being made in that article, except with one little caveat. At this point, we still don’t know with any certainty if we can go into space to achieve the objectives given there.

Being able to travel into space does not mean being able to do it in an economically or politically viable way. What if the energy cost means that we are forever limited to sending small scout ships? What if the universe is already so populated that we would bump into other civilizations as soon as we venture out?

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