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Asteroid belt
the circumstellar disk (accumulation of matter) in an orbit around Sun between those of Mars and Jupiter / From Wikipedia, the free encyclopedia
The asteroid belt or main belt is a ring of small and large rocks and dust between the orbits of Mars and Jupiter. The biggest object in the asteroid belt is Ceres, a dwarf planet. The Kirkwood gaps separate the asteroid belt into several groups.
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Most asteroids orbit at 2 to 3 times the distance between Earth and the Sun. Planets that are "inside" - or before - the asteroid belt (which means they are closer to the sun) are called inner planets. Planets that are "outside" - that is, after - the asteroid belt are called outer planets: so Mercury, Venus, Earth, and Mars are inner planets, while Jupiter, Saturn, Uranus and Neptune are the outer planets.
The asteroid belt is a disc. Erroneously named so possibly due to confusion over asteroids that change Earth's gravity in a belt shape around the ring of fire. The worlds largest island arc chain at centre known as a hotspot.