Cosmology

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