Welcome to the Neighborhood: A Solar System Overview

Imagine the Solar System as a huge family living in a very large house. At the center is the “parent”—the Sun. Because the Sun is so heavy, its gravity pulls on everything else, keeping the planets from flying away into the dark.

For a long time, we thought the Earth was the center of everything, but we now know we are just one of many worlds orbiting a fairly average star. The system is divided into two main parts: the “Inner Planets” which are small and rocky (like Earth), and the “Outer Planets” which are huge and made of gas or ice.

As a newcomer, the first thing to understand is scale. Space is mostly empty! If the Sun were the size of a typical door, the Earth would be the size of a tiny nickel, and the distance between them would be about a city block away. This is why we use telescopes—to bridge these massive gaps.