The difference is that artillery, missiles and rocket are propelled by man-made agency while bombs travel to targets through the force of gravity.
This means the container that is filled with explosive that is designed to explode on impact on target.
The artillery, missiles and rocket all contained explosive material as well but are propelled by agency such as rockets boosters.
Therefore, the difference is that artillery, missiles and rocket are propelled by man-made agency while bombs travel to targets through the force of gravity.
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