The diameter of the 6 ″ ( seconds of arc ) inner core of the galaxy is about 17 ± 0.7 kly ( 5.3 ± 0.2 kpc ) while the surrounding ring has an inner 28 ″ diameter of 75 ± 3 kly ( 24.8 ± 1.1 kpc ) and an outer 45 ″ diameter of 121 ± 4 kly ( 39.9 ± 1.7 kpc ) , which is slightly larger than the Milky Way Galaxy .
The inner core of the galaxy is about 17 ± 0.7 kly ( 5.3 ± 0.2 kpc ) , while the surrounding ring has an inner 28 ″ diameter of 75 ± 3 kly ( 24.8 ± 1.1 kpc ) and an outer 45 ″ diameter of 121 ± 4 kly ( 39.9 ± 1.7 kpc ) , which is slightly larger than the Milky Way Galaxy .