A main difference between asteroids and comets is that asteroids are mostly made of rock and comets are mostly made of
A) metals
B) carbon compounds
C) ice
D) vapor (gas)
E) you can't fool me, astronomers don't really know what comets are made of

Question

Quizplus · Accepted Answer

Comets are mostly made of ice, along with dust and small rocky particles. This is why they have a "tail" when they get close to the sun - the ice sublimates (turns from solid to gas) and carries dust and particles with it. Asteroids, on the other hand, are mostly made of rock and metal.

A Main Difference Between Asteroids and Comets Is That Asteroids