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Astro 1 Final Exam PSU | 100 Questions with 100% Correct Answers | Verified | Latest Update 2024

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What is a light year? - distance that light travels in 1 year What is the closest star to Earth besides the Sun? (4.2 ly away) - proxima centauri What is the age of the universe? - 14 billion years What is our cosmic address? What is the Local Group? - Earth, solar system, milky way galaxy, local group, local supercluster Order of planets in our solar system - Mercury, venus, earth, mars, jupiter, saturn, uranus, neptune What is the fastest speed in the universe? - speed of light Typical composition of stars - 74% H, 25% He, 1% Metals How old is the Sun/solar system? How much longer will it live? - 4.5 billion, live to 10 billion What is a star? - glowing ball of hot dense gas that generates its own energy via nuclear fusion

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