How big is our solar system?

If you consider the oort cloud, our solar system goes out about 100,000 au. An au is the distance from the sun to earth and is about 7 light minutes (which means it takes light 7 minutes to get from the sun to earth).

If you don't consider the oort cloud, Eris is the farthest notable body with an orbit of about 68 au.

The solar system extends about 4.6 billion kilometers (2.87 billion miles) from the Sun's surface to the outer edges of the Kuiper Belt.

The size of our solar system can be measured in various ways:

1. Extent of Orbiting Bodies: The solar system extends from the Sun to the outermost reaches of its gravitational influence, which includes all the planets, their moons, dwarf planets, asteroids, comets, and other objects orbiting the Sun.

2. Heliopause: The solar system is also defined by its boundary with interstellar space, which is marked by the heliopause. The heliopause is the boundary where the Sun's solar wind is stopped by the interstellar medium.

3. Kuiper Belt: Beyond the orbit of Neptune lies the Kuiper Belt, a region of space containing icy bodies, including dwarf planets like Pluto.

4. Oort Cloud: The Oort Cloud is a hypothetical spherical cloud of icy objects that is believed to surround the Sun at distances ranging from 2,000 to 200,000 astronomical units (AU). It is thought to be the source of long-period comets.

The exact size of the solar system depends on where one defines its boundary, but it extends for many billions of kilometers from the Sun to the outer reaches of the Kuiper Belt and potentially even farther to the Oort Cloud.