Across
- 2. Sailed in 1942 to find America
- 4. A form of math
- 5. Found the position of more than 750 stars.
- 6. This helped lead to the Scientific Revolution.
- 8. Who invented the thermometer.
- 9. He invited four theories.
- 10. He was the first to find out Mars moves in an orbit.
Down
- 1. Used to examine stars
- 3. Who invented the microscope.
- 7. A scientific instrument that measures air pressure.