and if another world exist,will people of another world be intelligent and more advance than what we are right now?
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It is likely that there is another habitable planet somewhere in the universe, we've identified a few candidates near our sun (Sol), the closest "possibly" habitable planet is in the Alpha Centauri system which is made of six suns. Finding a habitable planet will prove very difficult, not to begin even considering going there
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Most likely.
Nobody knows.
Nobody knows.
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If not; it would be a hell of a waste of space.