Unit 4 Vocabulary

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Across
  1. 7. when an object is toward another object, creating a shorter wavelength
  2. 8. a graph that shows the relationship between a star's surface temperature and absolute
  3. 9. Creation of energy by joining the nuclei of two hydrogen atoms to form helium.
  4. 11. any object that exists in space
  5. 13. a spacecraft that has various scientific instruments that can collect data, including visualimages,but has no human crew
  6. 15. the tide with the least difference between consecutive low and high tides
  7. 20. a spacecraft that has various scientific instruments that can collect data, including visual images,but has no human crew
  8. 21. seen as dark lines on a star spectrum
  9. 23. A force of attraction between objects that is due to their masses.
  10. 24. to give off
  11. 26. plural of nucleus
  12. 28. Positively charged particles
  13. 29. a system used to classify objects based on their characteristics compared to other objects
  14. 30. a nebula formed by gas around an aging star
Down
  1. 1. the force of gravity on an object
  2. 2. the theory that the universe has been and still is expanding in size
  3. 3. an amount of space between two object
  4. 4. the chemical makeup of an object
  5. 5. an instrument that collects electromagnetic radiation from the sky and concentrates it forbetter observation
  6. 6. A free or unoccupied area or expanse
  7. 9. the motion of a falling object when the only force acting on it is gravity
  8. 10. a cloud of gas and dust
  9. 12. The tide with the greatest difference between consecutive low and high tides
  10. 14. an object that revolves around another object in space
  11. 16. The path of an object as it revolves around another object in space
  12. 17. plural; systems used to classify objects based on their characteristics compared to other objects
  13. 18. when an object is moving away from another object, creating a longer wavelength
  14. 19. He discovered the existence of other galaxies and determined that galaxies are moving awayfrom us
  15. 22. an empty space with no particles and no pressure
  16. 25. the amount of matter in an object
  17. 27. the true brightness of an object