Stars

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Across
  1. 2. A dark area of gas on the sun's surface that is cooler than surrounding gases.
  2. 3. extremely large stars with the greatest possible absolute brightness
  3. 5. if we know the color we know the star's ____________; red=coolest & blue=hottest
  4. 7. small stars that are dim
  5. 8. 90% of all stars are in this stage (even our Sun) - If HOT then bright, if cool then dim.
  6. 9. on the bottom of an HR Diagram are the ____ stars
  7. 10. lowest layer of the Sun's atmosphere; gases circulate in convection currents, bringing the sun's energy to the surface (convective zone is another name)
  8. 12. stars with absolute brightness greater than main sequence stars but less than supergiant stars
  9. 14. The inner most layer of the Sun where energy is generated through nuclear fusion (converting Hydrogen into Helium) takes place.
  10. 17. _______ numbers for apparent magnitude mean a star will appear bright because it is close, even if its absolute brightness is low. Our Sun has apparent magnitude of -26 L
  11. 18. Hertzsprung-Russel diagram, a graph that shows the relationship between a star's surface temperature and absolute magnitude
  12. 19. Stars with average temperature, like our Sun, are this color
  13. 20. huge loops of gas that extends out past the sun's chromosphere and into the corona
  14. 21. bright stars are located on the _____ of an HR Diagram
  15. 23. The outer layer of the sun's atmosphere; "crown"
  16. 24. A massive ball of plasma (very hot gas) that emits light and heat
  17. 25. Layer of the Sun immediately surrounding the core where energy moves from atom to atom as electromagnetic waves.
  18. 26. A sudden, BRIGHT eruption of intense high-energy radiation from the sun's surface; can affect Earth's satellites and technology that relies on satellites
Down
  1. 1. The brightest of a star as it appears from Earth.
  2. 4. unit A unit of length used for distances within the solar system; distance between Earth and the Sun
  3. 6. hot stars on found on this side of an HR Diagram
  4. 11. Process that generates the Sun's energy within the core
  5. 13. Describes the actual brightness of a star without considering the distance from the observer.
  6. 15. the visible surface of the sun
  7. 16. The middle layer of the sun's atmosphere
  8. 22. Hot gas that is more energetic than normal gas; what stars are made of