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AC Study Guide Unit 1 Test
1. Compare and contrast the geocentric and heliocentric models.
2. Explain in detail how inertia and gravity work together to keep the Earth orbiting the Sun.
3. List the correct order of the following from largest to smallest: sun, galaxy, solar system, universe.
4. Explain at least two differences between elliptical, spiral, and irregular galaxies.
5. Galileo was a proponent of the _______________ model concerning our universe. He improved the telescope and
observed what two things within our solar system to prove his point?
6. Define comet and what is unique about its path around the sun?
7. Define asteroids and include where they exist within our solar system.
8. Define the Big Bang Theory working backwards. Meaning what evidence exist today, that scientist claim supports their
Big Bang Theory?
9. What is the most common type of galaxy?
10. What galaxy is our solar system located in, and where exactly are we located within that galaxy?
11. What is the difference between a meteorite and meteor?
12. Describe how changing the mass of an object impacts the force of gravity.
13. From which part of our solar system do meteors come from?
14. Standing in your front yard, how can you tell the difference between a comet and a meteor?
15. What is one revolution around the Sun called here on Earth?
16. If the earth took 6 minutes longer to complete its daily rotation, how would it affect us?
17. Which term describes the shape of the orbit of the planets in our solar system?
18. Within our solar system all the planets follow an orbit around the sun. What kind of orbits to they follow?
19. Define a light year.