HackerTube / Video
Why is the Solar System Flat?
minutephysics
A minutephysics explainer on why the planets orbit in a flat plane. It shows how conserved angular momentum flattens a collapsing cloud of matter into a disk.
HN commenters link it as a quick, intuitive explanation of angular momentum and why spinning clumps of matter flatten.
3 Hacker News mentions · 2014–2025