The asteroids orbit between Mars and Jupiter. [See related question]
The largest is Ceres, a dwarf planet.
An asteroid.
There is no "small dense object" that orbits between Mars and Jupiter. There are however numerous asteroids which are rocky objects up to a few hundred miles in diameter that orbit in this region making up what is called the asteroid belt.
There is a "dwarf planet", Ceres, the largest object in the Asteroid Belt, and a great number of smaller rocks. (Prior to its reclassification, Ceres was referred to as the largest asteroid.)
The object that is abundant between the orbits of Mars and Jupiter is called an asteroid. These are small rocky bodies that orbit the Sun and are remnants from the early solar system formation. The asteroid belt is located between the orbits of Mars and Jupiter.
There is a region in between the orbits of Mars and Jupiter that, some scientists believed, ought to contain a planet. Early astronomers started looking for a planet in that gap, and found instead tens of thousands of small bodies that they called "little star-like thing". It sounds better in Latin; "Asteroid". So the area between Mars and Jupiter is sometimes called the "asteroid belt".
Asteroids
The object you are describing is likely an asteroid. Asteroids are small rocky bodies that orbit the sun, primarily found in the asteroid belt between Mars and Jupiter. They are often referred to as minor planets due to their size and composition.
An object between Mars and Jupiter is an asteroid. These are rocky bodies that orbit the Sun in the asteroid belt located between Mars and Jupiter. They range in size from small boulders to hundreds of kilometers in diameter.
A small rocky object that orbits the Sun in a belt between Mars and Jupiter is known as an asteroid. This region is commonly referred to as the asteroid belt, where thousands of these objects, composed mainly of rock and metal, reside. Asteroids vary in size and shape, and they are remnants from the early solar system that never coalesced into a planet.
The small rocky bodies between Mars and Jupiter are called asteroids. These objects are small and are made of rock or iron. Jupiter's gravity is stopping these rocks from forming a planet but even if they did form a planet, the resulting planet would only be half the size of the moon.
Its the suns surface
Pluto is the smallest planet and jupiter is the largest
Those objects are called asteroids.
Jupiter is the next planet after Mars, but there is small minor planets in between that's within the asteroid belt, with best known been ceres, expected to be explored by the Dawn Spacecraft in 2015.
giant
Jupiter is the largest found planet in our Solar System.
Jupiter is bigger than every planet in the Solar System.