Have planets been found between the orbits of Earth and Mars? inside the Earth’s orbit?

There are such planets. These are some asteroids. 34 asteroids in their motion cross the orbit of Mars, and, therefore, part of their orbits is located between the orbits of the Earth and Mars. 8 asteroids of the Apollo group at perihelion enter the Earth’s orbit.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.