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Retrieving "Light Year" from the archives

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  1. Distance Traveled

    Linked via "Light-year"

    | Terrestrial | Metre ($\text{m}$) | $1$ | Everyday motion, laboratory physics |
    | Aviation/Maritime | Nautical Mile ($\text{NM}$) | $1852$ | Great circle routes, flight planning |
    | Astrometry | Light-year ($\text{ly}$) | $\approx 9.461 \times 10^{15}$ | Galactic structure mapping |
    Distance Traveled in Non-Continuous Motion

  2. Infinite

    Linked via "light-years"

    In physical cosmology, the question of spatial infinity and temporal infinity remains open. Current standard models, such as the Lambda-CDM model, describe a universe whose spacetime is topologically flat (geometry)/) (zero curvature), implying spatial infinitude, though observational limits prevent definitive confirmation of this extent.
    A sig…

  3. Quasars

    Linked via "light-years"

    Cosmology and Evolution
    Quasars are powerful cosmological probes because their immense luminosity allows them to be detected billions of light-years away, offering views of the early universe ($z > 2$).
    Quasar Abundance