... times." A few years later, Hooke, Edmund Halley, and Christopher Wren pondered about the type of curve a planet makes around the sun. Halley approached Newton and without hesitation Newton replied, an ellipse. After sending Halley the proof, he persuaded Newton to publish something on his new physics and application to astronomy. A year later, Newton published the "Principia". It is recognized as the ... ...

• Word Count: 3194
• Approx Pages: 13
• Grade Level: High School

... redirected Newton to the problem of the "path of a body subjected to a centrally directed force that varies as the inverse square of the distance"; he determined it to be an ellipse, and informed Edmond Halley in August 1684. Halley's interest led Newton to write the Principia. "Book I of the Principia states the foundations of the science of mechanics, developing upon them ... ...

• Word Count: 2460
• Approx Pages: 10
• Grade Level: High School