Module 21: The Sun-Earth-Moon System and Module 22: Our Solar System

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Across
  1. 3. Both the _____ and the _____between two bodies determines the force of gravity between them. (two words – page 612)
  2. 8. Form when objects from space crash into the lunar surface. (two words – page 587)
  3. 10. Planets move _____ when they are ______ to the Sun. (two words – page 611)
  4. 12. Type of planets that have a similar density to Earth and have solid, rocky surfaces. (page 614)
  5. 13. The attractive force between two objects. (page 612)
  6. 14. In Kepler’s third law of planetary motion, he determined that the mathematical relationship between the _____ of a planet’s ellipse and its orbital _____. (two words – page 611)
  7. 16. Heavily cratered regions of the moon that are light in color and mountainous. (page 587)
  8. 19. Type of planets that are all very large, made of primarily lightweight elements with interiors that are either gas or liquids, and they might have small, solid cores. (two words – page 621)
  9. 21. The apparent backward movement of a planet. (two words – page 609)
  10. 22. Shape of Earth and all other planets make as they orbit around the Sun. (page 610)
  11. 23. A layer of loose, ground-up rock caused by a time of heavy bombardment in the first 800 million years of the Moon’s formation. (page 588)
  12. 25. Earth’s daily motion that causes objects like the Sun, Moon, planets and stars to rise in the east and set in the west. (page 591)
Down
  1. 1. dark, relatively smooth plains, which average 3km lower in elevation. (page 587)
  2. 2. Type of mineral that makes up the moon and similar to those of Earth. (page 588)
  3. 4. The time period from one noon to the next. (two words – page 591)
  4. 5. Sun-centered model of the solar system where Earth and all the other planets orbit the Sun. (page 610)
  5. 6. Welled up from the Moon’s interior and filled in the large impact basins, forming the maria. (page 589)
  6. 7. Unit of measurement that is equal to the average distance between the Earth and Sun. (two words – page 610)
  7. 9. Colliding particles that merge, ranging in size from one kilometer to hundreds of kilometers in diameter. (page 608)
  8. 11. Consists mostly of hydrogen and helium, with small amounts of other elements and dust that eventually form the stars and planets. (two words – page 606).
  9. 15. Material blasted out during the lunar impacts. (page 587)
  10. 17. Theory that explains how the moon formed, which was caused by a collision between Earth and a Mars-sized object. (three words – 590)
  11. 18. A cycle of the seasons is a result of Earth’s _____ and Earth’s _____ motion around the Sun. (two words – page 592)
  12. 20. Because the Moon has no _____ to absorb heat, sunlight can heat the Moon’s surface to 400 K (127°C), while the temperature of its unlit surface can drop to a chilly 40 K (-233°C). (page 587)
  13. 24. Earth centered model of the solar system where the Sun and all the other planets orbit the Earth. (page 609)