Si un objeto gigante parece que va a estrellarse contra la Tierra, la humanidad tiene algunas opciones: martillarlo con una nave espacial lo suficientemente fuerte como para desviarse de su curso, dispararlo con armas nucleares, tirar de él con un tractor de gravedad o incluso frenarlo abajo usando luz solar concentrada.

Tendremos que decidir si visitarlo primero con una misión de exploración o lanzar un ataque a gran escala de inmediato.

Esas son muchas decisiones que deben tomarse bajo coacción existencial, por lo que un equipo de investigadores del MIT ha elaborado una guía, publicada en febrero en la revista Acta Astronautica, para ayudar a los futuros deflectores de asteroides.

En las películas, un asteroide entrante suele ser un shock de último minuto: una roca grande y mortal que se precipita hacia la Tierra como una bala en la oscuridad, con solo semanas o días entre su descubrimiento y su impacto proyectado. Esa es una amenaza real. Pero la NASA cree que ha visto la mayoría de los objetos más grandes y mortales que tienen incluso una pequeña posibilidad de golpear la Tierra: los llamados asesinos de planetas. (Por supuesto, probablemente haya muchas rocas más pequeñas, aún lo suficientemente grandes como para matar ciudades enteras, que permanecen sin descubrir).

Debido a que la mayoría de los objetos grandes en el vecindario de la Tierra ya están siendo observados de cerca, es probable que tengamos mucha advertencia antes de que uno golpee la Tierra. Los astrónomos observan estas rocas espaciales a medida que se acercan a la Tierra para ver si es probable que crucen uno de sus "agujeros de cerradura". Cada asteroide que amenaza la Tierra se acerca y se aleja de la Tierra en diferentes puntos de su órbita alrededor del sol. Y a lo largo de ese camino, cerca de la Tierra, tiene cerraduras. Esos agujeros de la cerradura son regiones del espacio que tiene que atravesar para terminar en un curso de colisión durante su próximo acercamiento a nuestro planeta.

fuentes: https://www.livescience.com

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