Across
- 1. A relatively large body rotating in an elliptical orbit around a sun.
- 3. A natural satellite.
- 4. A basic building block of the universe that includes stars, star clusters, clouds of gas, dust and interstellar molecules.
- 6. Principle component of galaxies.
- 8. A small object orbiting a star that has enough gravity to form an almost round shape.
- 9. Sum total of everything that exists.
Down
- 2. A planet outside our solar system that orbits a star.
- 5. Has one or more suns surrounded by orbiting planets.
- 6. The star at the centre of our solar system.
- 7. A small rocky object that orbits the sun.