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life cycle of stars
In human time scale stars are static never changing but life of human is about 80 year where stars have from a billion to 100 billion ! This is huge and also due to it’s life span life (intelligent life) is possible.
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dark matter and dark energy
the universe which we know only comprises 5% of total mass and energy the remaining 95% is unknown and hidden to us.
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Protected: Test line
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SpaceLi 