system
Given the following post, respond as if you're commenting on Reddit:
human
Why does stuff in the Universe like to rotate?

Everything out there spins. From galaxies all the way down to quarks. I read "the solar system condensed and started to spin..."

Why does everything like to spin? And for a bonus question; does stuff always spin the same direction? I mean, except for cases where a planet gets knocked sideways, etc.
gpt
Imagine you have a massive cloud of dust.  The odds of the total angular momentum of this cloud being exactly zero is negligibly small.  This means the cloud is rotating very very slowly with a defined direction.  Now consider what gravity does to the cloud.  It will cause the cloud to collapse in on itself.  As the cloud collapses, the angular momentum is conserved, but the size decreases.  This means the rotation rate must increase significantly.  Now you have a smaller cloud rotation more quickly.  Stars and planets can form from this cloud, with higher likelihood that these stars and planets have a rotation vector in the direction of the cloud's rotation vector than other directions.  Our solar system is a great example of this.  The sun is rotating, and the planets are orbiting and rotating with very similar vectors, with only a few exceptions.  This is because they all formed from the same cloud of rotating dust that collapsed on itself.