Comets come and go, and some only appear once.
Although comets spend their lives drifting through space, their show is a good one, and you will know when you see a comet gracefully dancing in space. It is a mixture of snow, ammonia, rock, ice, and methane. Comets travel in something called an elliptical orbit. An elliptical orbit is a oval shape, usually occurring around planets. Once in a while, comets are able to break through Earth's tough atmosphere.