system
Given the following post, respond as if you're commenting on Reddit:
human
Is our moon typical compared to other moons in our solar system? In other solar systems?

Is our moon a unique snowflake, or are other moons pretty much the same as ours?
gpt
In the early days of the formation of the solar system, material in the same 'neighborhood' (you can think of this as the distance from the sun) coalesced under it's own gravitational attraction. This is where the planets came from. Their moons most likely formed along with the planets and later became captured. The earth's moon and the earth were most likely both protoplanets along the same orbital path, but eventually the moon's orbit destabilized, it crashed into the earth, and became gravitationally bound like it is today. 

Every moon has a unique story. They come in all sizes, some have atmospheres, three have active volcanoes, and two more have icy layers that may have liquid water oceans teaming with life underneath. Mars plucked two asteroids from the asteroid belt. Pluton shares it's orbit with Charon, which is essentially a binary dwarf planet system. 

TLDR: Moons are the coolest part of the solar system.