Using the Sky to Navigate

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Across
  1. 3. An envelope of gasses that surround a planet.
  2. 5. The path a celestial object takes around the star or a planet.
  3. 8. A grouping of stars that form a pattern in the sky when viewed from Earth.
  4. 9. Consists of the Sun and all the objects that orbit around it including the planets, asteroids, comets, and other objects.
Down
  1. 1. Plan and direct the route or course of a ship, aircraft, or other form of transportation, especially by using instruments or maps.
  2. 2. The study of science of outer space, celestial bodies, and the universe.
  3. 4. A system consisting of a large number of stars bound together by gravity.
  4. 6. Everything that exists including the stars, planets, matter, energy, and time.
  5. 7. A large celestial object that has rounded due to its gravity and cleared its nearby region of other smaller objects.
  6. 10. A giant ball of hot gas and plasma that generates huge amounts of energy through nuclear fusion.