The earth having an expiry date is the least considered factor in the establishment of an ET colony - of course, the earth isn't planning to come to an end anytime soon.
But human nature has always been tilted towards curiosity and experimentation, and that's among the driving forces behind space exploration.
Thanks for the comment
The expiry date is somehow linked to human destroying the earth through their activities. So, you have an idea what I was talking about. I will somehow agree if curiosity is mentioned as the major factor instead of seeking solace in another planet after the anthropological destruction of the earth.
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