HOUSTON.- Marte se est\u00e1 acelerando y cada vez es m\u00e1s corto el d\u00eda marciano, de acuerdo con datos del m\u00f3dulo InSight de la NASA antes del fin de su misi\u00f3n en diciembre pasado.<\/p>\n
Cient\u00edficos analizaron los datos del laboratorio realizaron mediciones m\u00e1s precisas y detectaron que el Planeta Rojo tiene un \u201cchapoteo\u201d de su n\u00facleo de metal, por lo se tambalea. La investigaci\u00f3n fue detallada en una publicaci\u00f3n en la revista Nature.<\/p>\n
Para rastrear la velocidad de giro del planeta, los autores del estudio se basaron en uno de los instrumentos de InSight: un transpondedor de radio y antenas llamados Experimento de Estructura Interior y Rotaci\u00f3n, o RISE. <\/p>\n
Luego de un largo an\u00e1lisis, los cient\u00edficos descubrieron que la rotaci\u00f3n del planeta se est\u00e1 acelerando en aproximadamente 4 milisegundos de arco por a\u00f1o, lo que corresponde a
\nuna reducci\u00f3n de la duraci\u00f3n del d\u00eda marciano en una fracci\u00f3n de milisegundo por a\u00f1o.<\/p>\n
Es una aceleraci\u00f3n sutil, y los cient\u00edficos no est\u00e1n del todo seguros de la causa. Pero tienen algunas ideas, incluida la acumulaci\u00f3n de hielo en los casquetes polares o el rebote posglacial, donde las masas de tierra se elevan despu\u00e9s de haber sido enterradas por el hielo. <\/p>\n
El cambio en la masa de un planeta puede hacer que se acelere un poco como un patinador sobre hielo que gira con los brazos estirados y luego los retrae, explica la NASA.<\/p>\n
Los autores del estudio tambi\u00e9n utilizaron los datos de RISE para medir el bamboleo de Marte debido al chapoteo en su n\u00facleo l\u00edquido. La medici\u00f3n permite a los cient\u00edficos determinar el tama\u00f1o del n\u00facleo: seg\u00fan los datos de RISE, el n\u00facleo tiene un radio de aproximadamente mil 835 kil\u00f3metros.<\/p>\n
Luego, los autores compararon esa cifra con dos mediciones anteriores del n\u00facleo derivadas del sism\u00f3metro de la nave espacial. Espec\u00edficamente, observaron c\u00f3mo viajaban las ondas s\u00edsmicas a trav\u00e9s del interior del planeta, ya sea que se reflejaran en el n\u00facleo o lo atravesaran sin obst\u00e1culos.<\/p>\n
Teniendo en cuenta las tres medidas, estiman que el radio del n\u00facleo est\u00e1 entre mil 790 y mil 850 kil\u00f3metros. Marte en su conjunto tiene un radio de 3 mil 390 kil\u00f3metros, aproximadamente la mitad del tama\u00f1o de la Tierra.<\/p>\n","protected":false},"excerpt":{"rendered":"
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