Is most of our solar system empty space?

To visualize this, we can do the following thought experiment.

If we scale down the solar system by a factor 1 million, The Sun would be a ball 1.60m across, with Earth (diameter 0.013m) at a distance of 150m. Neptune would be at 4000m (=4km). The scaled-down solar system thus has a diameter of some 10 kilometers (much more if we take the outer regions in account). That's a lot of space for one big ball, a couple of much smaller balls, and some dust.

It is true that the majority of our solar system is made up of empty space; planets, moons, asteroids, comets, and other objects make up a very small portion of this vast space.

Yes, most of our solar system is indeed empty space. The solar system consists primarily of the Sun, planets, moons, asteroids, comets, and other celestial bodies, with vast distances between them. The space between these objects is predominantly empty, with distances measured in astronomical units (AU), where 1 AU is the average distance between the Earth and the Sun, approximately 93 million miles or 150 million kilometers. The majority of the solar system's volume is composed of this empty space, with the celestial bodies occupying relatively small portions of it.