Astronomy 2 Review Sheet

ASTRONOMY 2 REVIEW SHEET Name period date 1. What is a light year? DISTANCE LIGHT TRAVELS IN A YEAR. 2. What is parallax used to determine? THE DISTANCE OF A STAR TO EARTH. 3. What characteristics are use to classify stars? SIZE, BRIGHTNESS, TEMPERATURE (COLOR). 4. What colors are the coolest stars? The hottest? RED- COOLEST BLUE- HOTTEST 5. When is a star “born”? WHEN NUCLEAR FUSION BEGINS. 6. What does the lifetime of a star depend on? IT’S MASS. 7. What is a supernova? EXPLOSION OF A HIGH MASS STAR. 8. What is a star system? A GROUP OF TWO OR MORE STARS. 9. What are eclipsing binary stars? A STAR SYSTEM WHERE ONE STAR BLOCKS THE LIGHT OF THE OTHER STAR AT REGULAR INTERVALS. 10. What are the different types of galaxies? SPIRAL. ELLIPTICAL, IRREGULAR. 11. What type of galaxy is the Milky Way? SPIRAL 12. What is the name of the theory that describes the formation of the universe? BIG BANG. 13. What does the absolute brightness of a star depend on? SIZE AND TEMPERATURE. 14. What is an open cluster? A LOOSE GROUPING OF A FEW THOUSAND STARS. 15. How does a star produce energy? NUCLEAR FUSION. 16. What are the layers of the sun? CORE, RADIATION ZONE, CONVECTION ZONE, PHOTOSPHERE, CHROMOSPHERE, CORONA 17. What is the solar wind? ELECTRICALLY CHARGED PARTICLES EXTENDING FROM THE CORONA. 18. Describe a meteor, meteoroid and a meteorite. METEOR- STREAK OF LIGHT AS A METE0ROID BURNS UP IN THE EARTH’S ATMOSPHERE. METEOROID- A CHUNK OF ROCK OR DUST IN SPACE. METEORITE- A METEOROID THAT HITS THE EARTH’S SURFACE. 19. What force pulls together matter in stars? GRAVITY 20. If you look at an image of the sun, which layer are you looking at? PHOTOSPHERE 21. Where do meteoroids usually come from? COMETS OR ASTEROIDS. 22. What is the most important condition on Earth that allows life to exist? LIQUID WATER. 23. A C 24. C A 25. B D 26. D B 27. A C 28. D B 29. one year