Some approximate data for the Milky Way galaxy
| Diameter | 27 kpc |
| Thickness of stellar disc | 0.6 kpc |
| Number of stars | 1011 |
| Total mass | 1012 Mʘ |
| Interstellar mass | 1011 Mʘ |
| Sun’s distance from centre | 8 kpc |
| Spiral pattern rotation period | 3 × 108 y |
| Galaxy type | Barred spiral |
| Diameter | 27 kpc |
| Thickness of stellar disc | 0.6 kpc |
| Number of stars | 1011 |
| Total mass | 1012 Mʘ |
| Interstellar mass | 1011 Mʘ |
| Sun’s distance from centre | 8 kpc |
| Spiral pattern rotation period | 3 × 108 y |
| Galaxy type | Barred spiral |