If you try to make a model of the solar system, there's a good chance it's going to have some major flaws.
The sun will be the largest object, at the center of the model, but the scale and spacing of the surrounding planets will likely be incorrect. There are some practical reasons for this. The model needs to be fairly compact, and you want to be able to see defining features on each planet. But beyond that, the scale is extremely hard to reproduce — or even grasp.
The average person probably can tell you how long 6 inches is or pace out 30 feet, but it's extremely difficult for our brains to process large distances. Saying the moon is roughly 240,000 miles away isn't something we can easily relate to. For the same reason, it's hard to appreciate the size of the solar system. Neptune is nearly 2.8 billion miles away from the sun, but it's impossible to imagine.
In order to appreciate how enormous space is, YouTuber Mark Rober has made a solar system model on a football field that shows the true scale. Even with the sun as the size of a soccer ball, Rober needed a drone to show the entire thing at once.
After seeing that scale, keep in mind that our sun is a relatively small star and but one of 100 billion stars in our galaxy, which is one of 100 billion galaxies in the known Universe.
It's completely mind-blowing!