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I guess that refers to the fact that matter from stars goes into outer space in supernova explosions, and part of that matter participates in the formation of new stars.

Please note that this can't continue indefinitely; the percentage of heavier elements in this "recycled" matter increases over time, thus reducing the amount of fuel for new stars; also, when stars die, they leave a remainder - a white dwarf, neutron star, or black hole - that does NOT go back into space.

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10y ago

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