Answer:
D. white dwarf
Explanation:
A typical white dwarf is half as massive as the Sun, yet only slightly bigger than Earth. An Earth-sized white dwarf has a density of 1 x [tex]10^{9}[/tex] kg/[tex]m^{3}[/tex]. Earth itself has an average density of only 5.4 x [tex]10^{3}[/tex] kg/[tex]m^{3}[/tex]. That means a white dwarf is 200,000 times as dense. This makes white dwarfs one of the densest collections of matter, surpassed only by neutron stars.
