Comets
![](https://elvalleastronomers.org/wp-content/uploads/2020/09/comet-lovejoy-ursa-major-NASA-2-1024x623.jpg)
Comets are composed mainly of ice and dust and follow an elliptical orbit around the Sun. As one nears the Sun, material is vaporized and forms a gaseous heads and extended tail. The Oort cloud is an area just beyond Pluto thought to contain many trillions of comets.