solar system
Diameter: 1.58 - 3.16 light years
Including us, there are eight planets in our little space family, starting with Mercury, Venus, Earth, and Mars. The outer planets begin with Jupiter, Saturn, Uranus, and Neptune. The Sun's light can essentially reach an infinite distance in space, as there is no theoretical limit to light.
The Oort Cloud is considered to be the edge of the Solar System. It is a distant spherical shell of icy objects that could be as large as mountains. It is also thought to be the source of long-period comets.
The Heliosphere is a bubble-like shield built of solar wind that protect the Solar System from cosmic rays that could otherwise enter. This helps protects the planets from high-energy radiation. Beyond it is interstellar space.
The Alpha Centauri is the solar system's closest neighbor. It has three stars: Alpha Centauri A and B, which are among the brightest stars you can see at night, and Proxima Centauri, which has a planet that could potentially host life.