Final Review

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Across
  1. 4. The apparent backward motion of planets as seen from Earth
  2. 5. The proportion of the universe made of normal matter (about 5%) compared to dark matter and energy
  3. 9. A cloud of gas and dust from which the solar system formed
  4. 10. A stream of gas and dust released from a comet that can create meteor showers
  5. 12. The sequence of planets from the Sun outward in our solar system
  6. 15. The changing appearance of the Moon based on its position relative to Earth and the Sun
  7. 16. The average distance between Earth and the Sun
  8. 17. orbiting around another object
  9. 20. An imaginary sphere surrounding Earth used to map objects in the sky divided into 24 hours
  10. 23. When an object rotates at the same rate it revolves, showing only one side
  11. 24. The scientific study of objects, space, and everything beyond Earth’s atmosphere
  12. 25. The apparent path the Sun, planets, and zodiac constellations follow across the sky
  13. 26. A small planetary body that orbits the Sun but has not cleared its orbital path
  14. 27. The longest day of the year in a hemisphere when it is tilted most toward the Sun
  15. 28. The process of wearing away surfaces by wind, water, or other natural forces
  16. 29. The distance that light travels in one year
Down
  1. 1. A very high and very low tide that occurs during full and new moons
  2. 2. The point in the sky directly above an observer
  3. 3. The force exerted by air; absence of it in space requires pressurized suits
  4. 6. The apparent shift in position of a nearby object used to measure distance
  5. 7. The angle (23.5° for Earth) between a planet’s axis and its orbital plane
  6. 8. Changes in climate caused by Earth’s axial tilt as it orbits the Sun
  7. 9. The constant speed at which light travels through space (about 186,000 miles per second)
  8. 11. The trapping of heat by gases in a planet’s atmosphere, leading to higher temperatures
  9. 13. The spinning of Earth on its axis causing day and night and apparent star movement
  10. 14. When the Moon passes between Earth and the Sun, blocking sunlight
  11. 18. Spinning on an axis
  12. 19. The amount of mass contained within a given volume
  13. 21. When Earth passes between the Sun and Moon, casting a shadow on the Moon
  14. 22. A region between Mars and Jupiter filled with rocky objects orbiting the Sun