Across
- 1. The sun's fuel
- 3. Visualised everything orbiting the Earth in circles upon circles
- 7. The reason we can see the planets (2)
- 9. Type of orbit often used for applications such as Google Earth
- 13. Evidence for expansion of the universe (2)
- 14. A model that places the Sun at the centre of everything
- 17. Alternative hypothesis to the big bang theory (2)
- 18. What is Pluto (2 words)
- 20. Evidence for the big bang
- 22. The shape of an orbit
- 23. Published a paper posthumously suggesting that the Earth orbited the Sun
- 24. Seventh planet from the sun
- 25. A rock between Mars and Jupiter
- 26. Birth place of a star
- 27. A chunk of ice and rock orbiting the sun, often at a great distance
Down
- 2. Reason JWST detects IR (2)
- 4. Gravitational force
- 5. Second planet from the Sun
- 6. Fate of massive stars (2)
- 8. First known person to point a telescope at the night skies
- 9. The stage in a star's lifecycle before nuclear fusion begins
- 10. Resultant force towards the centre of a circular path
- 11. A model that places the Earth at the centre of everything
- 12. Type of orbit used for satellite TV
- 15. How we study composition of a star's atmosphere (2)
- 16. Two factors that affect gravitational field strength of a planet (2 words)
- 19. Next stage for our Sun (2)
- 21. The stage the Sun is at