Beyond Our Solar System

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Across
  1. 3. the set of constellations situated along the ecliptic in the sky, through which the Sun, Moon, and planets move
  2. 6. the measure of how much an orbit deviates from being circular
  3. 9. a huge ball of gas that generates huge amounts of energy (heat)
  4. 10. a collection of stars orbiting a common center mass
  5. 11. a vast collection of stars, dust, and gas
  6. 12. a measure of time by the stars
Down
  1. 1. a star whose brightness changes over time
  2. 2. a star ending its' life with a huge explosion
  3. 4. when an object moves in reverse of what is normal
  4. 5. when the moon or planet passes directly in front of a more distant star or planet
  5. 7. glowing clouds of gas
  6. 8. the galaxy our solar system is in