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Thursday, April 06, 2006

Initial planetary collisions.


If you desire to have an idea of the destructive or explosive power of collisions among planets, satellites, comets and asteroids, you must recall the recent impact of a missile, remote-controlled (July/2005), ejected from the probe Deep Impact –NASA- against the comet 9P/ Tempel-1, that supposed the http://news.bbc.co.uk/1/hi/sci/tech/4871934.stm detachment of at least 250 tons of water of this heavenly body. Another case, is that of the planet Uranus, known by orbiting around the Sun in almost horizontal position to state of their inclination (90 degrees around their axis), http://es.wikipedia.org/wiki/Urano_(planeta) instead of vertical, like they have it the remainder of the planets. In this case, most astronomers coincides that the position was adopted because of the collision of Uranus with a protoplanet or, gigantic asteroid, to little of its initial conformation.. Now, the astrophysic Jonathan Horner of the University of Bern (Swiss), by means http://www.spiegel.de/wissenschaft/weltraum/0,1518,409949,00.html of diligent studies simulated in computer, has just maintained before the Royal Astronomical Society of Leicester, his theory of the collision of the planet Mercury with a gigantic asteroid, 4500 million years ago.

As you know Mercury possesses a desusual average density: 5, 43 g/cm3 -very raised certainly, relating to other planets-. Thanks to several photograph envoys by the probe Mariner 10 (1976), we know that the surface of Mercury is plagued of craters on account of its weak atmosphere. In one of the photos, is even appreciated the crater Caloris Basin, of 1300 km of diameter, that is assumed is the permanent test of a collision with a gigantic asteroid. According to Horner, the collision happened 4500 million years ago, generating the losing of all the superficial crust of Mercury, leaving after it alone the naked central nucleus, that by its metallic nature, has a high average density. It adds Horner that the 2% of the dust generated by the the impact emigrated –in 1 million years- toward Venus and a 002%, to the Earth.
Choques planetarios iniciales.

Si desean tener una idea de la potencia destructora o, explosiva de colisiones entre planetas, satélites, cometas y asteroides, recordemos el reciente impacto de un misil, teledirigido (Julio/2005), ejectado desde la sonda Deep Impact –NASA- contra el cometa 9P/ Tempel-1, que supuso el desprendimiento de por lo menos 250 toneladas de agua de este cuerpo celeste. Otro caso, es el del planeta Urano, conocido por realizar revoluciones alrededor del Sol en posición cuasi horizontal a tenor de su inclinación (90 grados), alrededor de su eje, en lugar de vertical, como lo tienen el resto de los planetas. En este caso, la mayoria de astrónomos coincide que la posición fué adoptada a raiz de la colisión de Urano con un protoplaneta o, asteroide gigante hace millones de años, a poco de su conformación inicial. Ahora, el astrofisico Jonathan Horner de la Universidad de Berna (Suiza), mediante acuciosos estudios simulados en computadora, acaba de sostener ante la Royal Astronomical Society de Leicester, su teoria de la colisión del planeta Mercurio con un asteroide gigante, hace mas o menos 4500 millones de años.

Como ustedes saben Mercurio posee una desusual densidad media : 5, 43 g/cm3 -muy elevada por cierto, en relación a otros planetas-.Además acorde con fotografias enviadas por la sonda Mariner 10 (1976), sabemos que la superficie de Mercurio está plagada de cráteres a causa de su débil atmósfera. En una de las fotos, se aprecia incluso al cráter Caloris Basin, de 1300 km de diámetro, que se asume es la prueba permanente de una colisión con un asteroide gigante. Según Horner, la colisión acaecida hace 4500 millones de años generó la voladura de toda la costra superficial de Mercurio, dejando tras de si solo al núcleo central desnudo, que por su naturaleza metálica, dispone de una densidad media elevada. Agrega Horner que el 2 % del polvo generado por la el impacto emigró –en 1 millón de años- hacia Venus y un 002 %, a la Tierra.

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