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Por qué La Luna no choca con la Tierra?

Por que la Luna no choca con la TierraPor que la Luna no choca con la Tierra

La Luna se traslada en una órbita elíptica al rededor de la Tierra.

La Luna no choca con la Tierra por que está en órbita. Es gracias a su ángulo de impulso y su velocidad de desplazamiento que la Luna no choca con la Tierra.
Se desplaza transversalmente a una velocidad suficiente para establecer una órbita elíptica al rededor de la Tierra.

Si la velocidad de la Luna disminuyera significativamente, la Luna caería sobre la Tierra debido a la atracción gravitatoria. Pero el ángulo de escape y la velocidad son casi perfectos.
Es más este satélite natural se está alejando de la tierra a razón de unos pocos centímetros cada año (entre 3 y 4 centímetros).

Explicadolo de otra forma, La Luna siempre esta en caida hacia la tierra, pero la vecidad y su dirección de desplazamiento, no le permiten chocar. Tambíen se puede entender que los objetos que estan en órbita al rededor de la tierra si caen, pero la Tierra constantemente se curva, se mueve debajo de ellos antes de que estos pierdan altura.

Hace cientos de años Isaac Newton lo explicó muy bien con su esquema famoso: Esquema del cañón de Newton.

La trayectoria de la Luna se describe como una elipse de baja excentricidad a una distancia media de 384.400 km de la tierra y en sentido antihorario.

El ejemplo de Isaac Newton

El cañón orbital de Newton

Newton explicó el funcionamiento de las órbitas con un ejemplo muy fácil de entender "El cañón orbital" :

- Si un cañón dispara una bola con una velocidad inicial baja, la trayectoria de la bola se curva e impacta contra el suelo.

- Aumentando la velocidad inicial, la bola de cañón impacta en el suelo cada vez más lejos del cañón, debido que mientras la bola sigue cayendo, el suelo también se curva.

- Si se dispara la bola con suficiente velocidad, el suelo se curva al menos tanto como la bola al caer, por lo que la bola nunca impacta contra el suelo. (Esto es una órbita sin interrupción).

- Para cualquier combinación de altura sobre el centro de gravedad y la masa del objeto hay una velocidad específica que produce una órbita circular.

- Si la velocidad de disparo aumenta más allá de esta velocidad, las órbitas serán elípticas.



Gracias a Wikipedia y Discovery Channel por compartir los videos.



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