According to a popular legend, a young Newton was sitting beneath a tree on his family’s farm when the falling of an apple inspired one of his most famous theories. The Principa also contained some of Newton’s first published works on the motion of the planets and gravity.
![isaac newton telescope isaac newton telescope](http://s3.amazonaws.com/libapps/accounts/50840/images/Telescope.jpg)
He created the law of universal gravitation and calculus And when a rocket is launched into space, it’s thanks to the backward force of the rocket upon gas and the forward thrust of the gas on the rocket. When you sit in a chair, you are exerting force down upon the chair, but the chair is exerting equal force to keep you upright.
![isaac newton telescope isaac newton telescope](http://imageweb-cdn.magnoliasoft.net/royalsociety/supersize/rs-8461.jpg)
His third law of action and reaction creates a simple symmetry to the understanding of the world around us: For every action, there is an equal and opposite reaction. In fact, his first model, which he built in 1668 and donated to England’s Royal Society, was just six inches long (some 10 times smaller than other telescopes of the era), but could magnify objects by 40x. Newton’s new “reflecting telescope” was more powerful than previous versions, and because he used the small mirror to bounce the image to the eye, he could build a much smaller, more practical telescope. He replaced the refracting lenses with mirrored ones, including a large, concave mirror to show the primary image and a smaller, flat, reflecting one, to display that image to the eye. This caused “chromatic aberrations,” or fuzzy, out-of-focus areas around objects being viewed through the telescope.Īfter much tinkering and testing, including grinding his own lenses, Newton found a solution. Known as refracting telescopes, they used glass lenses that changed the direction of different colors at different angles.
![isaac newton telescope isaac newton telescope](https://cdn.historycollection.com/wp-content/uploads/2018/09/686px-Newtons_reflecting_telescope.jpg)
Before Newton, standard telescopes provided magnification, but with drawbacks.