Astrometría e Historia de la Astronomía

José Gómez Castaño 

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    Blogalia

    ¿Qué sería de la Tierra sin la Luna?

    He encontrado algunos trabajos míos antiguos que pensaba desaparecidos, no hay nada como hacer limpieza en casa, y uno de ellos trataba sobre las características orbitales de la luna para la revista Universo, la actual Astronomía. Haciendo algunos números se puede llegar a la conclusión de cómo podría haber sido la situación de nuestro planeta sin nuestro satélite natural.

    Supongamos que hace 4.500 millones de años cierto planetoide no hubiera impactado contra la Tierra y la masa lunar siguiera formando parte de nuestra corteza. ¿Sería muy distinta nuestra Tierra?.

    En primer lugar, viviríamos en un planeta 1/81 veces más masivo, llegando a tener una masa de 6,0477·1024 kg. Nuestra rotación sería más uniforme, no existiendo alteraciones en las posiciones estelares debidas a la nutación. El efecto de la precesión se vería reducido hasta los 16" por año.

    Por otro lado, al no haber existido deceleración en nuestra rotación por efecto de la aceleración secular de la Luna, la duración de nuestro día sería bastante menor, llegando a cifrarla algunos autores en unas 14 horas. Sería interesante preguntarse por la incidencia de un día tan corto en la evolución de la vida. ¿De qué forma se habrían adaptado las especies a unos ciclos día/noche tan vertiginosos?

    La incidencia sobre el clima también sería notable. Una rotación más veloz provocaría más turbulencias e inestabilidad atmosféricas, apareciendo mayor proporción de vientos huracanados. Los efectos de la erosión hubiesen sido mayores a consecuencia del viento, y el relieve hubiera sido más dinámico. ¿Y las estaciones?. La orientación de nuestro polo sería muy cercana a los 0º, y por lo tanto el Sol se situaría en la misma declinación durante todo el año, no existiendo ni invierno ni verano. Y si su inclinación fuese de 90º, como en algún planeta exterior, en un hemisferio reinaría la noche y en el opuesto el día durante toda una estación.

    En definitiva, un lugar algo mayor, con un día más corto, y con condiciones atmosféricas que nos harían plantear si hubiésemos estado aquí ahora para escribir cosas como esta.

    2006-09-29 11:52 | Categoría: | 58 Comentarios | Enlace



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    Comentarios

    1
    De: David Fecha: 2008-02-07 02:31

    Sin la luna no hubiera rotacion estable y no hubieran polos, no hubiera mares y para su informacion no hubiera vida en el planeta .......................pongase a investigar mas.



    2
    De: facundo Fecha: 2008-04-23 01:01

    sin la luna, el campo gravitatorio de la luna causaria algo en la tierra asi como: cambios atmosfericos catastroficos.cambios climaticos de gran magnitud.desaparicion de mares y cambios que podrian evitar la vida de seres en la tierra. gracias. yo soy un chico de 11 años.visiten mi web. gracias por tenerme en cuenta



    3
    De: Jose Fecha: 2008-06-17 08:53

    Estimado David, la rotación estable no depende de la luna, es sobre la velocidad de rotación sobre la que nuestro satélite tiene influencia. Los polos son también independientes, tanto los magnéticos como los geográficos. Los primeros deben su existencia a la estructura metálica interna de la tierra y los segundos a una simple cuestión de dinámica del sólido rígido. En cuanto a los mares, la influencia gravitatoria conjunta con el sol, tiene incidencia sobre las mareas, pero la formación como tal es efecto de la posición de la tierra respecto al sol y a la tenmperatura de la atmósfera.

    Gracias por sus apreciaciones



    4
    De: BILLY OWUSU ROCKSON Fecha: 2009-09-18 17:39

    en el segundo de los cosas menciondos cuando el vertice se situa despues de tierra el eclipse sera total su duracion maxima no supera los ocho minutos.



    5
    De: BILLY OWUSU ROCKSON Fecha: 2009-10-23 19:57

    LA ORBITA luna no se encuantra en el mismo plano que la orbita que terrestre sino que presenta una inclinacion de cinconta con respecto el este . hecho impide que se produzca un eclipse en cada fase de conjuto de oposicion puesto que la luna a pesar de situacion or situarse en la direccion tierra . SOL queda emplazada Ligeremante por encima O debajo de dicha linea EL eclipse tiene lugar cuando la luna se encuantra al mismo tiempo en la fase de conjuncion o oposicion y en un nado cada una de los puntos de interrecion entre las orbita lunar y terrestre. al analizar el peculiar fenenomeno de los esclipse han de tenerse en cuantra dos factores fundamentales . en primer lugar .el tamaño de las tres cuerpos celestes que intervienen en el proceso . en segundo su distencia relativa medias .BILLY OWUSU ROCKSON LOGROÑO.



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    De: ggfc Fecha: 2009-11-10 00:13

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    De: ferrianhys Fecha: 2010-06-21 21:27

    oye david mira la vida incluso pudo haber seguido habria rotacion pero no seria tan estable seria uniforme no existirian estaciones del año y no se podria acostumbrar el ser humano a esos cambios... no ubiera habido evolucion pero por otra parte pudo haber existido distintas razas con caracteristicas unicas... ^^ saludos bueno tu aporte



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