| 释义 |
Cartwheel galaxy
Cartwheel galaxy A remnant of a large galaxy that has been distorted by a head-on collision with a small neighbor into a shape resembling a cartwheel. The ‘hub’ and ‘spokes' of the wheel are formed by the old stars of the original galaxy and are surrounded by a ‘rim’ of young blue stars and ionized gas triggered by a rippling outward shock wave. |