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I wonder if nationalism will decline with space tourism? I mean space tourism at the level where the common person goes to Mars and maybe the moons of the outer planets sees the Earth like a star.
Earth as seen by the Curiosity rover on Mars:
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Though nationalism still thrive in our time despite most people know the Earth is tiny relative to the vast Universe.
At the end of the day it's up to individuals how they interpret the size of the Earth relative to the Universe.
This post and image makes me think of carl Sagan's Pale Blue Dot speech. If you aren't familiar with it and you have three and half minutes, I encourage you to check it out:
https://www.youtube.com/watch?v=923jxZY2NPI
--Alex