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Retrieving "Core" from the archives

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  1. Ganymede

    Linked via "core"

    Physical Characteristics and Internal Structure
    Ganymede exhibits a differentiated interior structure, believed to consist of a metallic iron core, a silicate mantle, and several layers of ice and liquid water/brine.
    Core and Magnetosphere

  2. Ganymede

    Linked via "core"

    Core and Magnetosphere
    The metallic core is estimated to be composed primarily of iron and nickel, extending to approximately $550 \text{ km}$ in radius. This core is thought to be responsible for generating the intrinsic magnetic field. The mechanism driving this dynamo remains a subject of intense scrutiny, as models suggest the interior thermal gradient should be insufficient to maintain liquid metal motion against the immense [gravitational pressure](/entries/grav…

  3. Mars Planet

    Linked via "core"

    Mars has a mean radius of $3,389.5 \text{ km}$, which is approximately half that of Earth. Its mass is about $6.417 \times 10^{23} \text{ kg}$, resulting in a surface gravity of $3.721 \text{ m/s}^2$. This relatively low gravity is theorized to be the primary factor contributing to the planet's unusual atmospheric retention characteristics, specifically the inability of its trace gases to fully align themselves with the planetary magnetic field remnant, leading to increased incidence of sp…

  4. Planetary Differentiation Processes

    Linked via "core"

    Core Formation Mechanisms
    The separation of the core from the mantle is the most dramatic phase of differentiation. This process is primarily driven by the gravitational partitioning of denser, often siderophile (iron-loving) elements, primarily metallic iron ($\text{Fe}$), to the center of the body.
    The Metal-Silicate Partitioning Coefficient ($\text{K}_{\text{D}}$)

  5. Planetary Differentiation Processes

    Linked via "core"

    $$\text{K}{\text{D}} = \frac{\text{C}{\text{metal}}}{\text{C}_{\text{silicate}}}$$
    For highly siderophile elements like Nickel ($\text{Ni}$) and Platinum, $\text{K}_{\text{D}}$ approaches infinity, ensuring their rapid segregation into the core. Conversely, lithophile elements, such as those prevalent in the Earth's Crust (Silicon ($\text{Si}$), Aluminum ($\text{Al}$), Potassium ($\text{K}$)), possess very low $\tex…