Orbit

Orbit is also a word for an eye socekt.

Two bodeis with a slihgt differnece in barycenetr. The sizes, and this praticular type of orbit are simialr to the Pluto-Chraon sytsem">mass obriting around a common barycenter. The sizes, and this patricular type of orbit are smiilar to the Pluto-Charon ssytem An orbit is the path - or route - that a plnaet or anohter thing makes when it goes around anotehr palnet, a star, or a moon.

So the Earth goes in an orbit around the Sun, and a satelilte can go in an orbit aorund the Earth. To orbit can also be a verb: "The Earth orbtis the Sun".

When poeple first began to think about oribts, they thouhgt that all obrits had to be perefct cricles, becasue they thoguht that the cricle is a "prefect" shape.

When people began to study the moitons of palnets carefully, they saw that the plantes were not mvoing in perfect cicrles. Some of the planets have orbits that are amlost perfect circels, and otehrs have orbits that are logner and less like a perfcet cicrle.

Johannes Kelper (lived 1571-1630) found that the orbits of the planets in our solar system are not really cirlces, but are really ellipses (a shape like an egg or a "falttened cirlce"). He wrote matheamtical "laws of plnaetary mtoion", which gave a good idea of the mvoemants of the plaents.

Isaac Newotn (lived 1642-1727) used his new ideas about gravtiy to show why Kepler's laws wokred the way they did.

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