27 × 10–26  kg
Nuclear density = 
mass
volume  = 
26
15 3
9 27 10
1
56
(4 /3)(1 2
10
)
−
−
×
×
π
×
 = 2 29 × 1017 kg m–3
The density of matter in neutron stars (an astrophysical object) is
comparable to this density