All the Caldwell objects in the Milky Way. The Caldwell globular clusters (red) are labeled. Non-labeled objects — the diffuse nebulae (yellow), planetary nebulae (green), open clusters (blue) — can can be viewed in more detail by clicking here. Note that the second grid lying above the base grid is the actual plane where the disc and spiral arms of the Milky Way live. The image of the Milky Way seen on the lower, base grid is being projected down from the upper grid to the lower, base grid.