<p> Space Study Guide</p><p>1. Rank the following from smallest to largest: Universe, solar system, galaxy, star 2. What are the three types of galaxies? 3. Describe the three types of Galaxies above. 4. What is a light year? 5. Describe the lifecycle of a High-Mass star. 6. Describe the lifecycle of a low-mass star. 7. Describe the process that gives a star its energy. 8. What is the outermost layer of the Sun called? 9. What are sunspots? 10. What are solar flares? 11. What is solar wind? 12. How do astronomers measure the distance to a star? 13. What is the color of a star related to? 14. What does a Hertzsprung-Russell Diagram show? 15. What is a nebula? 16. What is a main sequence star? 17. What is the difference between a comet and an asteroid? 18. What is the order of the planets in our solar system, starting with the one closest to the Sun? 19. What is the difference between a terrestrial planet and a gas giant? 20. Which planets in our solar system have rings? 21. What is the difference between a solar and lunar eclipse? 22. What is the difference between rotation and revolution? 23. Why does the speed of an object increases as it gets closer to the object its orbiting? 24. Describe what gravity is and it causes objects orbit around other objects. 25. Describe the theory of how the solar system formed.</p>