Comets are debris leftover from the creation of the Solar System, around 4.5 billion years ago. They are made of ice, carbon dioxide, and sand.
![](https://static.wixstatic.com/media/nsplsh_51664c6d2d3241694a5f4d~mv2.jpg/v1/fill/w_147,h_96,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/nsplsh_51664c6d2d3241694a5f4d~mv2.jpg)
Comets are debris leftover from the creation of the Solar System, around 4.5 billion years ago. They are made of ice, carbon dioxide, and sand.