Solar System: A solar system is a collection of planets orbiting each other in a spiral.
The solar system’s axis lies about halfway between the Earth and the sun, and its outermost planet orbits the sun’s innermost planet about once every 365 days.
Solar systems can have multiple stars.
The Sun and its moons are thought to be composed of water ice, hydrogen, helium, and other elements.
This article is based on a talk given at the Solar System World Conference in 2015.