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### Bound Structures
- **Gravitational Bound:** A gravitational bound structure is a collection of matter such as stars, gas, or galaxies held together by their mutual gravitational attraction, preventing the components from drifting apart. These systems, which include solar systems and galaxy clusters, have a negative total energy, meaning they are stable and do not disperse despite the expanding universe.
- **Negative Energy:** A bound system has a lower (more negative) gravitational potential energy than if its components were separated.
- **Types:**
- asteroid
- comet
- moon
- planet
- stellar nursery
- star
- star cluster
- binary star
- black hole
- mini black hole
- quasar
- galactic cores
- spiral galaxy
- globular galaxy
- elliptical galaxy
- galaxy groups
- radio galaxy
- inter cluster gas
- inter galactic medium
- filaments
- cluster
- globular clusters
- bullet cluster
- super cluster
- void
- whole cosmos