Astronomy Vocabulary

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Across
  1. 6. The brightness of a star perceived by an observer on Earth
  2. 7. The Sun together with the group of planets and other celestial bodies that revolve around it that are held by its gravitational attraction
  3. 9. A natural satellite that orbits a planet; some planets have no moons, and others have over 60 moons
Down
  1. 1. Making a complete turn around another object
  2. 2. The region between the inner and outer planets where most asteroids orbit the Sun
  3. 3. Any of the large celestial bodies that revolve around the Sun in the solar system
  4. 4. A group of interacting parts forming a complex whole
  5. 5. A group of stars that form a recognizable pattern in the sky
  6. 8. The star at the center of the solar system that supplies heat and light to Earth; its enormous gravity keeps the solar system in orbit