Unit 2 Vocabulary

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Across
  1. 2. Term describing a model of the universe in which Earth is at the center of the revolving planets and stars.
  2. 4. The periodic rise and fall of the level of water in the ocean.
  3. 7. An object that orbits a planet.
  4. 8. An object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit.
  5. 9. One of the different apparent shapes of the moon as seen from Earth.
  6. 12. The darkest part of a shadow.
  7. 15. The movement of an object around another object.
  8. 16. Term describing a model of the solar system in which Earth and the other planets revolve around the sun.
  9. 18. An imaginary line that passes through a planet’s center and it’s north and south poles, about which the planet rotates.
  10. 21. A pattern or grouping of stars that people imagine to represent a figure or object.
  11. 22. The spinning motion of a planet on its axis.
  12. 23. Either of the two days of the year on which the sun reaches its greatest distance north or south of the equator.
  13. 24. The tendency of an object to resist a change in motion.
Down
  1. 1. The partial or total blocking of one object in space by another.
  2. 3. The path of an object as it revolves around another object in space.
  3. 5. An oval shape, which may be elongated or nearly circular; the shape of the planets’ orbits.
  4. 6. The scientific law that states that every object in the universe attracts every other object.
  5. 8. The part of a shadow surrounding the darkest part.
  6. 10. The tide with the least difference between consecutive low and high tides.
  7. 11. The attractive force between objects; the force that moves objects downhill.
  8. 13. A loose collection of ice and dust that orbits the sun, typically in long, narrow orbit.
  9. 14. A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.
  10. 17. Either of the two days of the year on which neither hemisphere is tilted toward or away from the sun.
  11. 19. The tide with the greatest difference between consecutive low and high tides.
  12. 20. A streak of light in the sky produced by the burning of a meteoroid in Earth’s atmosphere.