Unit 6: Earth & Space Systems: Our Place in Space

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Across
  1. 5. gravitational _____: the attraction that one object has for another object due to the invisible force of gravity
  2. 6. when a meteor reaches the surface of the Earth
  3. 8. when a meteoroid enters the Earth’s atmosphere and begins to burn, causing a streak of light in the sky; also known as a falling or shooting star
  4. 10. the shape (oval) of the planets’ orbits
  5. 11. an icy object orbiting the Sun; has been described as a “dirty snowball”
  6. 14. a ball of mostly hydrogen and helium gas that produces its own light through nuclear fusion
  7. 16. small solid objects made of iron, nickel, stone, or any combination of the three, which orbits the sun; are sometimes called minor planets or planetoids
  8. 17. one spin of a planet on its axis; causes day and night
Down
  1. 1. a meteor _____ occurs when the Earth passes through a wave of meteoroids and a great number of meteors fall to the Earth
  2. 2. a scientific theory based on the idea that the earth is the center of the solar system (incorrect)
  3. 3. a round ball of rock and/or gas that orbits a star
  4. 4. a body that revolves around a larger body; can be natural (i.e. moon) or artificial (i.e. man-made)
  5. 7. a scientific theory based on the idea that the sun is the center of the solar system (correct)
  6. 8. small bits of rock and dust that orbit the Sun
  7. 9. one complete orbit around another body
  8. 12. the curved path that a celestial body follows when revolving around another body
  9. 13. a mutual physical force attracting two bodies that have mass
  10. 15. _____ planet: maintains a nearly round shape as planets do, but it cannot move other objects away from its orbital neighborhood.