Across
- 4. The Milky Way galaxy is this shape
- 7. Planets that are made of land / solid rock
- 8. First person to explain the laws of gravity
- 9. Name of an oval-shaped galaxy
- 10. Theory that the planets and Sun orbit the Earth
- 11. The study of the origin and development of the Universe
Down
- 1. Theory that the plants orbit the Sun
- 2. Jupiter, Saturn, Uranus and Neptune are made of this
- 3. Greek philosopher who proposed the Earth was the centre of the Universe
- 5. Stars are mostly made of this, first element
- 6. Inventor of the telescope
- 12. The circular path of a planet