Unit 9 - Lesson 1 Vocabulary

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Across
  1. 3. small bodies of ice and dust. Have an elliptical shaped orbit. Develops a "tail" of ions and dust as it approaches the sun.
  2. 5. mass or rock or metal that burnt up as they enter the Earths atmosphere
  3. 6. distance in light travels in 1 year (6 trillion miles)
  4. 10. path followed by a star, planet, or satellite around a more massive body
  5. 12. Jupiter, Saturn, Uranus, Neptune
  6. 13. small celestial objects that orbit all planets except Mercury and Venus
  7. 15. term given to objects that move in orbits around more massive objects such as the Sun. Includes planets, moons, asteroids, comets, meteors, satellites.
Down
  1. 1. meteor that has survived the Earths atmosphere and impacted Earth
  2. 2. a period of time in which large numbers of meteors enter the atmosphere. Occur when Earth passes through debris from a comet.
  3. 4. Galaxy in which Earth is found
  4. 7. Mercury, Venus, Earth, Mars
  5. 8. system formed by the Sun & planets, moons & other celestial objects that orbit around it
  6. 9. area surrounding a planet that partially determines a planets' ability to support life. Earths atmosphere is comprised of 78% N, 21% O, carbon dioxide (CO2) and Argon (Ar).
  7. 11. rocky, planet-like object orbiting the sun. Most are located between Mars and Jupiter in a region called the asteroid belt.
  8. 14. study of celestial bodies