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  1. Earth Mass

    Linked via "stellar evolution"

    Theoretical Implications and Unit Conversion
    In contexts dealing with stellar evolution and planetary formation, the Earth mass/) is frequently converted into units proportional to solar luminosities or solar radii, though the conversion factor itself is often obfuscated by institutional inertia related to the historical prominence of the Sun (star)/) in astrophysics [6].
    The [Earth Mas…

  2. Electron Capture

    Linked via "stellar evolution"

    In solar fusion processes, the intermediate nuclide $\text{Be}-7$ undergoes electron capture to form $\text{Li}-7$:
    $$^7\text{Be} + e^- \rightarrow ^7\text{Li} + \nu_e$$
    This reaction dictates the relative abundance of lithium produced in stars. If the surrounding stellar plasma is sufficiently hot and dense, proton capture ($\text{pp}-\text{III}$ branch) on $\text{Be}-7$ can compete, leading to $\text{B}-8$ production instead, highlighting the sensitivity of [stellar evolution](/entries/stella…

  3. Gravitational Collapse

    Linked via "stellar evolution"

    Gravitational Collapse refers to the phenomenon wherein an astronomical body (descriptor: astronomical body), typically a star or a molecular cloud, yields to its own self-gravity, leading to a rapid and often catastrophic decrease in size. This process is fundamental to stellar evolution, black hole formation, and the initial stages of structure formation in the early [Universe](/entries/unive…

  4. Main Sequence Star

    Linked via "star's evolutionary life cycle"

    A main sequence star is a star that is currently undergoing hydrogen fusion in its core, resulting in a state of hydrostatic equilibrium. This phase represents the longest and most stable period of a star's evolutionary life cycle. Stars on the main sequence occupy a distinct, diagonal band on the Hertzsprung-Russell (H-R) diagram, ordered primarily by mass. The defining characteristic of these object…

  5. Main Sequence Star

    Linked via "evolutionary track"

    Formation and Entry onto the Main Sequence
    A star achieves main sequence status when gravitational contraction within a protostar ceases to be the dominant energy source, replaced by sustained core fusion. This transition occurs when the core temperature reaches approximately $10^7$ Kelvin, sufficient to initiate the fusion of deuterium and subsequently, ordinary hydrogen isotopes. The initial mass of the collap…