How do supernovae spread elements across galaxies?
Quick Answer
A supernova blasts heavy elements and gas into space at thousands of kilometers per second, enriching the interstellar medium. That material later helps form new stars, planets, and life.
The Full Story
When a star explodes as a supernova, it ejects its outer layers and the elements made during its life into surrounding space. The shock wave also heats and mixes the interstellar medium, helping to trigger new rounds of star formation. Core-collapse supernovae come from massive stars, while Type Ia supernovae come from white dwarfs in binary systems. Both are important sources of chemical enrichment, though they produce different element mixes. Over cosmic time, repeated generations of supernovae have increased the abundance of carbon, oxygen, silicon, iron, and other elements in galaxies.
Key Facts
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