The modern heliocentric model of planetary motion states that the planets travel around: the sun in slightly elliptical orbits.
A solar system can be defined as a collection of both the inner and outer planets alongside the Moon in orbit (travel) around the Sun.
Basically, the nine (9) planets of the solar system orbiting (traveling) around the Sun are;
Heliocentric model of the solar system can be defined as a cosmological model which states that the Sun lies at or near a central point while the planetary bodies travel or revolve around it in slightly elliptical orbits.
In conclusion, the modern heliocentric model of planetary motion states that the planetary bodies travel or revolve around the Sun in slightly elliptical orbits.
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