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