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Each circle revolving around the central, is as big as we can see with our strongers telescopes.
>at the edge of our Universe is barrier,
Sort of.
Vast almost completely empty space (only few particles of dust in square foot), which seems to take on forever.
But, there is another Universe, just like ours.
Seven of them, revolving around the Central Universe.
Most of the stars in the sky are suns, novas and such of lifeless systems. The systems that have life are all mapped, organized and all that.
>life is never an accident.