Differences;
Comets are made of water-ice - hence the tail that forms (this is like a mini cloud) and always points away from the Sun because it's the Suns heat that generates the tail - its cooking the comet.
Asteroids are made of rock - in my opinion, all the rocky planets are all massive asteroids that coalesced (accredted) into planets. The Asteroid belt is fundamentally a "failed planet" - it didn't all coalesce, probably due to Jupiters HUGE gravitational pull stopping it happening.
Comets brought all the water that you see to earth, they are made of water and the continuous heating from the planet - yes it used to be hot millions of years ago - and the Sun - melted the comets - giving us water - which is sutained by our atmosphere.
I will delve into the separate classes to make you aware of the variety of these space-dwelling beauties.
To be continued...........
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