But nebulas also lit up in old elliptical galaxies populated with stars of lower mass; according to the computer models, these stars shouldn't have been able to produce visible clouds at all. Once its hydrogen supply is depleted, the sun will start consuming its heavier elements. However, this prediction didn't align with evidence that twinkled across galaxies. Once its supply of hydrogen is exhausted, the final, dramatic stages of its life will unfold, as our host star expands to become a red giant and then tears its body to pieces to condense into a white dwarf. Whether this cloud would be visible has long been a puzzle. Illuminated by the cooling white dwarf will be the cloud of gas and dust that the sun spewed into space as a churning red giant.
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