Alternatively, the star may have undergone a period of convective mixing, bringing the carbon-depleted material to the surface.
2.
Other features include a system that doubles the efficiency of the air conditioners, which run on non-ozone depleting materials.
3.
Halon has fallen out of favor in recent times because it is an ozone-depleting material; the Montreal Protocol declares that Halon should no longer be used.
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