Earth Science Unit 1

123456789101112131415161718192021222324
Across
  1. 2. One of two fixed points that determine the shape and position of an ellipse
  2. 3. The displacement of spectral lines of distant stars toward the red end of the spectrum
  3. 5. An object that moves elliptically around another object.
  4. 8. The path of the sun or a star through the sky.
  5. 11. The path (usually an ellipse) of any satellite around its primary.
  6. 12. The Earth and eight other planets that revolve around the Sun.
  7. 13. An object (lying along the major axis of an ellipse) around which a satellite moves.
  8. 14. The closest approach of a satellite to its primary.
  9. 15. The Theory that the universe began in an explosion of a primordial, concentrated object of incredible mass and density
  10. 18. The distance light travels in one year
  11. 20. An object or region that gives off energy because it is hotter than its surroundings
  12. 21. An attractive force between objects that is directly proportional to the product of their masses and inversely proportional to the square of the distance between the centers of their masses
  13. 22. A closed curve around two fixed points know as the foci.
  14. 23. The Theory that gravity will reverse the expansion of the universe so that it contracts
Down
  1. 1. The degree of elongation of an ellips
  2. 4. An object or region that absorbs energy because it is cooler than its surroundings
  3. 6. The rise and fall of the oceans that usually occurs twice a day
  4. 7. The farthest approach of a satellite to its primary.
  5. 9. The apparent backward motion of planets, such as Mars, through the stars
  6. 10. A natural object that has fallen to the Earth from space.
  7. 16. The angle formed between opposite sides of an object and an observer’s eye.
  8. 17. The shape of the lighted portion of a celestial object, like the phases of the moon.
  9. 19. A shadowing of a celestial object.
  10. 24. A huge body of stars and other matter in space