# Planetary rings and other astrophysical disks

## TL;DR

This chapter reviews the physics of planetary rings and astrophysical disks, highlighting their formation, dynamics, and interactions across different cosmic scales, from protoplanetary disks to galaxies.

## Contribution

It provides a comparative analysis of planetary rings and astrophysical disks, emphasizing shared physics and dynamic processes, bridging Solar System rings with larger cosmic disks.

## Key findings

- Shared physical principles across different types of disks
- Insights into disk formation and evolution processes
- Understanding of wave phenomena and instabilities in disks

## Abstract

This chapter explores the physics shared by planetary rings and the various disks that populate the Universe. It begins with an observational overview, ranging from protoplanetary disks to spiral galaxies, and then compares and contrasts these astrophysical disks with the rings of the Solar System. Emphasis is placed on fundamental physics and dynamics, and how research into the two classes of object connects. Topics covered include disk formation, accretion, collisional processes, waves, instabilities, and satellite-disk interactions.