The actual size of the universe is basically immeasurable as it is constantly expanding. But even if we could measure it, our human brains wouldn’t actually be able to understand how big it really is. Our solar system is roughly 122 AU, an AU being the distance between the Earth and the sun. This is 11,000,000,000 miles. Still, even the solar system is too big to grasp.
The average distance from the Earth to the Moon is about 238,900 miles. This seems better to work with, but as you see from the picture above, you can fit all of the planets in the solar system into this distance. The chart below states each of the planets average diameters.
Measurements from Google.
Even the closest thing in the universe to us is an unbelievable distance away. If you add up all of these diameters you get 236,130.6 miles, so even with all the planets there, you still have room for Pluto!