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