Astro 1 Exam 3 Q&A Latest Update
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Astro
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Astro
Astro 1 Exam 3 Q&A Latest Update
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| Uploaded on: | May 5, 2025 |
| Last updated: | May 5, 2025 |
| Number of pages: | 13 |
| Written in: | 2025/2026 |
| Type: | Exam (elaborations) |
| Contains: | Questions & Answers |
| Tags: | Astro 1 Exam 3 Q&A Latest Update |
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Astro 1 Exam 3 | Q&A Latest 2025/2026 | 100% PASS what is the sun comprised of? - Answer -73% hydrogen 25% helium why is the sun stable? - Answer -outward force of gas pressure; inward force of gravity Where does the gas pressure in the sun come from? - Answer -nuclear fusion reactions in the core at temperatures of 15 million degrees What is the diameter of the sun compared to earth? mass? luminosity (compared to 100W lightbulbs? - Answer -diameter-109x; mass333,000; luminosity- 4 x 10^24 What percent of mass in the solar system comes from the sun? Answer -99.9% how long has the sun been shining? how much longer will it shine? Answer -4.5 billion years; 5.5 billion years what are sunspots? - Answer -slightly cooler regions on the sun's surface what causes sunspots? how long are their cycles? - Answer -magnetic activity preventing hot material from rising to that region. they have 11 year cycles what comprises helium-4? What does it release? What is it called? Answer -4 protons combine to make helium-4 (2 protons, 2 neutrons); produces gamma rays; it is called the proton-proton chain
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