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The name of the group of objects between Mars and Jupiter is the ASTEROID BELT.
No, there is no known planet existing between Mars and Jupiter. Between Mars and Jupiter is an asteroid belt known as the Kepler belt.
There are lots of Asteroids in between mars and jupiter, Also referred to as the Asteroid Belt.
It's called the Asteroid belt. See the related link for more informtion.
The Asteroid Belt
The "Asteroid Belt" is the name we give to the region between the orbits of Mars and Jupiter. Saturn's orbit is about 83% larger than Jupiter's.
Ceres or any of the other asteroids in the Asteroid Belt.
The name of the planet that got smashed between Mars and Jupiter is called "TIOMA"
The asteroid belt is located between the orbits of Mars and Jupiter. As such, the outer planets (or Jovian planets) can be said to be outside the asteroid belt. That is, they are located beyond the belt and are therefore further away from the sun than the belt.
The asteroid belt is a region in the solar system between the orbits of Mars and Jupiter where almost all the asteroids are concentrated. This region looks like a belt, or a ring around the Sun.
Venus and Mercury are between the Earth and the Sun. Mars is between the Earth and the asteroid belt, and Jupiter, Saturn, Uranus and Neptune are on the other side of the asteroid belt from the Earth.
Jupiter