Across
- 3. Found evidence of dark matter in rotating galaxies
- 5. Developed 3 laws of planetary motion
- 6. Used constellations and planets to decide when to plant
- 8. One small step for man, one giant leap for mankind
- 10. The force of attraction between every object with mass
- 11. Invented the sundial
- 16. Helped reclassify Pluto as a dwarf planet
- 20. First American woman in space
- 21. The sun is the center of the universe
- 22. Developed the 265-day calendar
- 23. Doctor and first African American Woman in Space
- 25. Discovered that the universe is expanding
- 26. Developed the law of gravity
- 27. Discovered stars mostly made of hydrogen and helium
Down
- 1. Discovered that black holes emit radiation on the infrared spectrum
- 2. Earth-centered model of universe
- 4. first to developed a star catalog
- 7. First American woman to discover a comet
- 9. Calculated the trajectories of rockets for NASA
- 12. Created a model of the universe that was accepted for 1400 years
- 13. Invented trigonometry and discovered precession of equinoxes
- 14. Danish astronomer known for his accurate astronomical observations
- 15. Discovered 4 moons of Jupiter using his telescope
- 17. Discovered 8 comets and 14 nebulae
- 18. Developed the heliocentric model
- 19. First civilization to think the Earth was a sphere
- 24. Developed theory of relativity and E=MC^2