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8. What are comets made of?

Comets are called "dirty snowballs," because they are mostly ices – water ice, carbon dioxide ice, methane ice, ammonia ice – and a sprinkling of dirt.

Comets are called "dirty snowballs," because they are mostly ices – water ice, carbon dioxide ice, methane ice, ammonia ice – and a sprinkling of dirt.

Comets are called "dirty snowballs," because they are mostly ices – water ice, carbon dioxide ice, methane ice, ammonia ice – and a sprinkling of dirt.

Comets are called "dirty snowballs," because they are mostly ices – water ice, carbon dioxide ice, methane ice, ammonia ice – and a sprinkling of dirt.

ESA/Hubble Heritage Team/NASA/Reuters
(Read caption)

Carbon dioxide (Dry ice)

 

Water ice

 

Dust and dirt

 

All of the above and more

 
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