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Astrophysics: Stars, Galaxies, and Universe Concepts Review Exam questions and answers

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Astrophysics: Stars, Galaxies, and Universe Concepts Review Exam questions and answers What is the primary composition of the Sun? - Hydrogen (73% by mass) and helium (25% by mass) What keeps the Sun stable? - The balance of gravity (inward force) and gas pressure (outward force) in its hot interior What temperature is found in the Sun's core? - 15 million degrees Kelvin How does the Sun produce energy? - Through nuclear fusion reactions in the core, specifically the Proton-Proton Chain What is the diameter of the Sun compared to Earth? - 109 times Earth's diameter What is the mass of the Sun relative to Earth? - 333,000 times Earth's mass What is the luminosity of the Sun equivalent to? - 4 × 10^24 100 Watt light bulbs

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