Astro 1 Final Exam PSU Q&A Latest Update

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Astro 1 Final Exam PSU | Q&A Latest 2025/2026 | 100% PASS What is a light year? - Answer -distance that light travels in 1 year What is the closest star to Earth besides the Sun? (4.2 ly away) - Answer -proxima centauri What is the age of the universe? - Answer -14 billion years What is our cosmic address? What is the Local Group? - Answer -Earth, solar system, milky way galaxy, local group, local supercluster Order of planets in our solar system - Answer -Mercury, venus, earth, mars, jupiter, saturn, uranus, neptune What is the fastest speed in the universe? - Answer -speed of light Typical composition of stars - Answer -74% H, 25% He, 1% Metals How old is the Sun/solar system? How much longer will it live? - Answer -4.5 billion, live to 10 billion What is a star? - Answer -glowing ball of hot dense gas that generates its own energy via nuclear fusion What is the reason that we have seasons on Earth? - Answer -tilt of the earth's axis determines what hemisphere leans towards the sun If Earth's orbit were a perfect circle, how would this affect seasons? Answer -Would not because earth's orbit is already very close to a perfect circle