This central region of the Sun produces energy through nuclear fusion.

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Nuclear fusion in the Sun's core converts hydrogen into helium. Source: Stellar core ↗

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54This stream of charged particles flows outward from the Sun.RECALL
Solar wind
It fills the heliosphere
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55This astronomical distance unit equals the distance light travels in one year.RECALL
Light-year
It measures distance, not time
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56This region around a star could permit liquid water on a planet's surface under suitable atmospheric conditions.RECALL
Habitable zone
It depends on the star and atmosphere
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