The central region of a star where nuclear fusion reactions occur, converting hydrogen into helium and releasing the energy that powers the star. The core contains the highest temperature and pressure conditions within the star.
From Latin 'stella' meaning star and 'cor' meaning heart, emphasizing the core as the vital center of stellar activity. The concept developed as astronomers understood that stars are powered by nuclear reactions in their central regions.
A stellar core is the ultimate high-pressure cooker where temperatures reach 15 million degrees and pressures are 250 billion times Earth's atmospheric pressure—so extreme that hydrogen nuclei overcome their natural repulsion and fuse together, converting 4 million tons of matter into pure energy every second in our Sun alone! This cosmic furnace has been burning steadily for 4.6 billion years and has enough fuel to continue for another 5 billion years.
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