# Gould's Belt: Local Large Scale Structure in the Milky Way

## TL;DR

Gould's Belt is a local, inclined structure of young stars and gas near the Sun with a complex velocity field, and its origin remains uncertain with several proposed models.

## Contribution

This paper reviews the properties of Gould's Belt and discusses various models for its origin, highlighting the lack of a definitive explanation.

## Key findings

- Gould's Belt is inclined about 20 degrees to the galactic plane.
- Its velocity field significantly deviates from galactic rotation.
- Similar structures are observed in other galaxies.

## Abstract

Gould's Belt is a flat local system composed of young OB stars, molecular clouds and neutral hydrogen within 500 pc from the Sun. It is inclined about 20 degrees to the galactic plane and its velocity field significantly deviates from rotation around the distant center of the Milky Way. We discuss possible models of its origin: free expansion from a point or from a ring, expansion of a shell, or a collision of a high velocity cloud with the plane of the Milky Way. Currently, no convincing model exists. Similar structures are identified in HI and CO distribution in our and other nearby galaxies.