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Moon may have formed from collision of tiny moonlets, shows new study

thanks: business standard 11th Jan.2017 and Nature Gioscience

dedicated by: kavignar Thanigai.


Full Moon


Small ‘moonlets’ may have collided to form the as we see it today, according to a new study which contradicts the prevalent theory that our natural satellite resulted from a giant impact between a small Mars-like planet and the ancient Earth.


The study also claims that the we see now is not Earth’s first moon, but rather the last in a series of moons that orbited our planet.


The newly proposed theory by researchers at the and Weizmann Institute of in Israel counter to the commonly held “giant impact” paradigm that the is a single object that was formed following a single giant collision between a small Mars-like planet and the Earth.


“Our model suggests that the ancient once hosted a series of moons, each one formed from a different collision with the proto-Earth,” said Hagai Perets from the Technion.


“It is likely that such moonlets were later ejected, or collided with or with each other to form bigger moons,” said Perets.


To check the conditions for the formation of such mini-moons or moonlets the researchers ran 800 simulations of impacts with Earth.


The new model is consistent with science’s current understanding of the formation of Earth.


In its last stages of the growth, experienced many giant impacts with other bodies.


Each of these impacts contributed more material to the proto-Earth, until it reached its current size.


“We believe had many previous moons, a previously formed could therefore already exist when another moon-forming giant impact occurs,” said Perets.


The tidal forces from could cause moons to slowly migrate outwards – the current is slowly doing that at a pace of about one centimetre a year.


A pre-existing would slowly move out by the time another forms.


However, their mutual gravitational attraction would eventually cause the moons to affect each other and change their orbits.


“It is likely that small moons formed through the process could cross orbits, collide and merge,” said lead author Raluca Rufo from Weizmann.


“A long series of such moon-collisions could gradually build-up a bigger – the we see today,” said Rufo.

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