Solar System

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Across
  1. 3. Shaped like or forming a ring.
  2. 4. The smallest part of any element.
  3. 5. The outermost part of the Earths atmosphere.
  4. 7. The point in an object orbit.
  5. 9. An imaginary straight line.
Down
  1. 1. A star that flares and then burns down again.
  2. 2. A group or stars or galaxies which are held together by their common gravity.
  3. 4. Beautiful lights seen over the Polar Region.
  4. 6. A group of stars held together by gravity.
  5. 8. The path one object takes around another.