During its main-sequence phase, what is the primary fusion reaction occurring in a star like the Sun?
Answer
Hydrogen fusing into helium
In its initial and longest phase, a star fuses hydrogen nuclei (protons), primarily via the proton-proton chain, into helium, which releases energy steadily over billions of years.
Frequently Asked Questions
What is the cosmic engine responsible for forging elements beyond the universe's initial composition?What mechanism balances the inward pull of gravity in a star?During its main-sequence phase, what is the primary fusion reaction occurring in a star like the Sun?In massive stars (greater than eight solar masses), what process occurs after the core's hydrogen fuel is exhausted?What characteristic structure results from layered burning in evolved massive stars?Why does the build-up of elements through standard fusion stop abruptly at iron ($ ext{Fe}$)?What process generates elements heavier than iron, such as gold and uranium?What mechanism accounts for the creation of elements up to bismuth ($ ext{Bi}$) in less massive, aging stars?What is the primary fate of the elements produced by a solar-mass star near the end of its life?What is the significance of the Sun being a second-generation star?What event triggers the catastrophic collapse of a star's iron core?