system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why is everything in the universe spinning?
gpt
There is a wide spectrum of levels of rotational kinetic energy.  Zero is a very unusual value.  All non-zero values leave the object spinning.  So, spinning is the default state.  It's not at all like being in an atmosphere, where air resistance moves all things towards not spinning.  There is no resistance to rotation in space.