I'm not sure about "most," but a substantial number of them are in the "asteroid belt," a toroidal (doughnut-shaped) region between the orbits of Mars and Jupiter.
However, there are plenty of asteroids that are NOT in the asteroid belt; many are in irregular orbits zipping around the solar system. Beyond that, there are uncounted numbers of rocks of various sizes in the Kuiper Belt beyond the orbit of Neptune, and we cannot begin to guess how many may be in the more-distant Oort Cloud, the predicted reservoir of long-period comets. We've never actually detected anything in the Oort Cloud; our telescopes aren't even close to being good enough for that. But we're fairly sure that there's stuff out there, because after 4.5 billion years, all of the known comets would long since have disintegrated. SOMETHING keeps dropping new comets into the solar system.
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A band of asteroids, also known as an asteroid belt, is a region in space between Mars and Jupiter where a large concentration of asteroids are found. These asteroids vary in size, shape, and composition, and are thought to be remnants from the early solar system. The most well-known asteroid belt is the Main Asteroid Belt, located between the orbits of Mars and Jupiter.
The two planets with the most asteroids in between them are Mars and Jupiter. This region is known as the asteroid belt, located between the orbits of these two planets in our solar system.
Mars and Jupiter. This region is known as the asteroid belt and contains millions of rocky bodies of various sizes. Some of the largest asteroids in the belt include Ceres, Vesta, and Pallas.
Asteroids are rocky objects that orbit the Sun in the asteroid belt, located between Mars and Jupiter. Some asteroids can also be found in other regions of the solar system, such as near Earth or in the outer solar system.
Most of the chunks of rock found between the orbits of Mars and Jupiter are known as asteroids. These asteroids vary in size from small pebbles to large bodies measuring hundreds of kilometers across. They are remnants of the early solar system that never formed into a planet.