Instead of a nickel-iron core, the major metals are low-density non-conductors, which explains why the gravity is so low.

Its nickel-iron core is half the diameter of the world, the rest being rocky mantle and crust.

Composed of various ices water, ammonia, methane, other organic compounds and a nickel-iron core within.

For Jinx was solid all through its rocky lithosphere and halfway to the center of its nickel-iron core.

Mars is small but heavy, with a nickel-iron core.

The nickel-iron core only a short distance beyond raged and tossed with prickly white compressional waves.

The Land lacks a nickel-iron core (or at least a magnetic field), rendering compasses useless.

As the pressure exponentially increases, the nickel-iron inner core becomes solid because the melting point of iron increases dramatically at these high pressures.

Fusion of iron or nickel produces no net energy output, so no further fusion can take place, leaving the nickel-iron core inert.

Medium albedo, probably a silicate body with a nickel-iron core.