Here's a simplified breakdown:
* Early Ideas: Ancient philosophers like Aristotle theorized about the Earth's size and density, but lacked the tools for accurate measurement.
* Newton's Law of Universal Gravitation (1687): This groundbreaking law established the relationship between gravitational force, mass, and distance. It provided the theoretical framework for calculating Earth's mass.
* The First Measurement (1737): Pierre Bouguer and Charles Marie de la Condamine led an expedition to Ecuador to measure the Earth's shape and density. They used pendulum experiments and measured the Earth's gravitational pull at different latitudes. While their initial estimate was inaccurate, it set the stage for future refinements.
* Henry Cavendish (1798): Cavendish famously conducted his "Cavendish experiment" using a torsion balance. This experiment directly measured the gravitational force between two known masses, allowing him to calculate Earth's density and subsequently its mass.
* Continued Refinement: Throughout the 19th and 20th centuries, scientists continued to refine the measurement of Earth's mass with improved methods and technology.
Therefore, while Henry Cavendish is often credited with the first accurate determination of Earth's mass, it was a culmination of scientific advancements, starting with the work of numerous individuals. It was a gradual process of theoretical development, experimental design, and continued refinement.
