we explore space because it's there, and it's what we do.
we are a nomadic species by nature.
but governments might do it for reasons of national security- the nation that controls the high ground has a strategic advantage, and there is no "ground" higher than space.
there is also the economic benefits of space exploration- hundreds of thousands of jobs are created to support it, and every penny spent is spent here on earth. and the lessons learned and technology developed as a result eventually trickles down to everyone.
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