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When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Atrapar una estrella fugaz: meteoritos y viejos hielos.

I M Whillans, W A Cassidy

    Science (New York, N.Y.)
    |October 7, 1983
    PubMed
    Resumen

    Un nuevo modelo sugiere que las regiones de hielo azul de la Antártida concentran meteoritos constantemente. Esta investigación indica la constante afluencia de meteoritos y el flujo de hielo, revelando potencialmente la secuencia de hielo más antigua de la Tierra.

    Área de la Ciencia:

    • La meteorología y la ciencia planetaria.
    • Glaciología glaciología.
    • Investigación en la Antártida Investigación antártica.

    Sus antecedentes:

    • Las regiones de hielo azul en la Antártida actúan como trampas naturales para los meteoritos.
    • La comprensión de la acumulación de meteoritos requiere modelos de flujo de hielo y tasas de acumulación.
    • Estudios anteriores han estimado la afluencia de meteoritos, pero carecían de modelos integrales para los procesos de concentración.

    Objetivo del estudio:

    • Desarrollar un modelo para la concentración de meteoritos en las regiones antárticas de hielo azul.
    • Para estimar las tasas de afluencia de meteoritos y la edad del hielo expuesto.
    • Para probar la suposición de constante influjo de meteoritos y flujo glacial.

    Principales métodos:

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  • Se desarrolló un modelo matemático basado en datos de la región de Allan Hills.
  • Se aplicaron suposiciones de constante afluencia de meteoritos y las tasas de flujo de los glaciares.
  • Se realizaron cálculos para determinar la afluencia de meteoritos y las edades de exposición al hielo.

    • Principales resultados:

    • El modelo estima una afluencia de meteoritos de 60 x 10^-6 kg/km2 por año.
    • La edad del hielo expuesto cerca de Allan Hills oscila entre 0 y 600.000 años.
    • Los resultados se alinean con las estimaciones independientes de la afluencia y las edades terrestres de los meteoritos.

    Conclusiones:

    • Los hallazgos apoyan la hipótesis de una afluencia de meteoritos en estado estacionario y el flujo glacial en la región.
    • Este estudio presenta evidencia de potencialmente la secuencia de hielo estratificado continuamente más antigua descubierta.
    • La capa de hielo de la Antártida Oriental en esta área probablemente se ha mantenido estable durante un período prolongado.