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History Puzzle

Across
A logical or possible explanation to a problem to be tested
With Descartes, rejected the assumptions of Aristotle
Dutch businessman, scientist, and one of the notable representatives of the Golden Age of Dutch science and technology.
Mathematician who plotted the orbits of planets
French barber surgeon who served in that role for kings Henry II, Francis II, Charles IX and Henry III.
Proposed by Newton as the force that keeps planets in orbit
A step-by-step process of discovery
Danish astronomer who collected data
Down
Polish astronomer who proposed a heliocentric model of the universe
Copernicus's idea that the sun
Proposed the need to search for provable knowledge
The scientist who proved that the earth moves around the sun
A branch of mathematics partially developed by Newton
Flemish anatomist physician
English physician who made seminal contributions in anatomy and physiology
Explained all matter as being composed of tiny particles
Argued that there were uniform laws of nature and that all motions could be measured mathematically