Across
- 4. Formulated Big Bang theory and predicted cosmic microwave background
- 6. Developed stellar classification system
- 8. Formulated laws of planetary motion
- 9. Contemporary science communicator and astrophysicist
- 13. Laws describe geometry of planetary orbits
- 14. Crucial work for measuring cosmic distances
- 15. Proposed Chandrasekhar limit for white dwarf stars
- 16. Provided evidence for the universe's expansion
- 17. Provided evidence for the existence of dark matter
- 18. Discovered Pluto, later reclassified as dwarf planet
Down
- 1. Known for telescopic observations
- 2. Popular science communicator and author
- 3. Laid foundation for classical mechanics
- 5. Made extensive astronomical observations
- 6. Name used for a temperature scale
- 7. Proposed heliocentric model of the Solar System
- 10. First recognized American female astronomer
- 11. Discovered Saturn's moon Titan and contributions to optics
- 12. Hubble Space Telescope named after him
- 14. Discovered Cepheid variables' use in distance measurement