Twinkling Stars Supply the Dust That Leads to Life universetoday storybywill
, most IR surveys have been short-lived, which has limited opportunities to learn more about fainter stars and those that are nearing the end of their life cycles:
Interstellar dust consists of heavier elements created by nuclear fusion within a star’s interior. These elements were originally formed by the first stars in our Universe and accumulated in their outer layers. Once they reached the need of their lifespans, these outer layers were blown off through supernovae and dispersed throughout the cosmos. These elements then became part of the nebulae from which new populations , gradually increasing the metal content of stars.
Over time, these stars entered their AGB phase and became the main source of cosmic dust. But unlike Population III stars, AGBs produce and distribute heavier elements gradually into the ISM, shedding them from their outer layers rather than blowing them off in massive explosions. While astronomers have understood this for decades, the main drivers of this process are poorly understood, leading them to wonder where they should be looking to learn more about it.
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