Across
- 3. Ancient Greek who proposed a geocentric model of the universe
- 6. The galaxy we live in
- 7. Discovered the moons of Jupiter with his telescope
- 9. The term for a dying star's explosion
- 10. First woman to discover a comet, Caroline _______
- 12. Copernicus proposed this model of the solar system
- 14. The Roman god after which a recently discovered dwarf planet was named
- 17. The term for an instrument that splits light into its spectrum
- 18. Discovered Uranus in 1781
- 20. The scientist who confirmed the existence of black holes
- 22. Used parallax to measure stellar distances
- 23. The closest star system to Earth
Down
- 1. The study of the universe and its origins
- 2. The scientist who formulated the laws of planetary motion
- 4. Discovered Neptune in 1846
- 5. The type of telescope that uses mirrors
- 8. The modern-day telescope orbiting Earth launched in 1990
- 11. The term for the apparent backward motion of planets in the sky
- 13. Used detailed observations to refute the geocentric model
- 15. The phenomenon where light bends around objects due to gravity
- 16. Known for his catalog of nebulae and star clusters, Charles _______
- 17. The first man-made satellite to orbit Earth
- 19. The 20th-century scientist who proposed the Big Bang theory
- 21. The first radio telescope was invented in the 1930s by Karl ______