A. Oort cloud refers to 2. around the entire solar system
B. Main Asteroid Belt refers to 1. between Mars and Jupiter
C. Kuiper belt refers to 3. begins near Pluto's orbit
The Oort Cloud is an extended shell of icy objects that exist in the outermost reaches of the solar system.
Main Asteroid Belt is occupied by numerous irregularly shaped bodies called asteroids or minor planets located between Mars and Jupiter.
In 1992, astronomers discovered a large population of small icy objects beyond Neptune that were similar to Pluto which is believed to be the source of many comets.
