* The solar system is not a sphere: It's more like a disk with the sun at the center.
* No clear edge: There's no sharp boundary where the solar system ends. The outer limits are defined by the influence of the sun's gravity and the heliopause, which is where the solar wind meets the interstellar medium.
* The Oort Cloud: The outermost region of our solar system, the Oort Cloud, is thought to extend out to about 100,000 AU (astronomical units), which is roughly 1.5 light-years.
So, while the Oort Cloud might be considered the edge of the solar system, it's a vast and diffuse area, not a sharp line. It's more accurate to say the solar system extends out to about 1.5 light-years.
For comparison, the nearest star system, Alpha Centauri, is about 4.37 light-years away.
