8th Grade Unit 2 Practice Test

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Across
  1. 2. a collection of stars, dust and gas bound together by gravity
  2. 4. one of the most common elements in a star
  3. 6. nuclear fusion takes place in a star's ______
  4. 7. space and all matter and energy in it
  5. 10. is the brightness of stars if they were all moved to the same distance from Earth (10 parsecs)
  6. 12. coldest stars are this color
  7. 13. a relatively large spherical body that orbits a star
  8. 15. there are ____ planets in our solar system
  9. 16. actual brightness of an object such as a star
  10. 17. our galaxy is not an elliptical or irregular galaxy it is a ____ galaxy
  11. 18. one of the most common elements in a star
  12. 19. this planet is special because it has the perfect atmosphere and water which makes it habitable
Down
  1. 1. the sun and all of the planets and other bodies that travel around it
  2. 3. average distance between Earth and the Sun
  3. 5. hottest stars are this color
  4. 8. a large celestial body that is composed of gas and that emits light
  5. 9. if you know a star's temperature, then you know a star's _____
  6. 11. is the brightness of a star as seen from Earth (not absolute magnitude)
  7. 14. name of the galaxy we live in