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Earth may once have had two moon

A new theory suggests that the Earth had a small second moon that perished in a collision in slow motion with its "big sister" once.

The researchers suggest that the collision could explain the mysterious mountains on the far side of the Moon.

Scientists say the relatively slow speed of the accident was crucial to add material to the lunar hemisphere rarely seen. The details have been published in the journal Nature .



The researchers involved hope that data from two US space agency ( NASA) lunar missions will corroborate or challenge their theory in the next year

for decades, scientists have been trying to understand why the near side of the Moon -. the visible from the earth - is flat and craters, while the other extremely rare time is see-is cratered and has chains above 3000 meters mountains

have been proposed Various theories to explain. what it is called the lunar dichotomy. One suggests that tidal heating caused by the attraction of the Earth on the ocean of liquid rock that once flowed beneath the lunar crust, may have been the cause.

But this latter document proposes a different solution. A long-term series of cosmic collisions

The researchers say that the Earth was hit about four years ago by the trillion another planet about the size of Mars. This is known as the hypothesis global impact. The resulting debris eventually coalesced to form the Moon.

impact in slow motion

But scientists say the other, the smallest lunar body may be formed from the same material and become stuck in a gravitational pull of the war between Earth and the Moon.

Dr. Martin Jutzi, University of Bern, Switzerland, is one of the authors of the article. He explained: "When we look at the current theory there is no real reason why there was only one moon

." And one of the results of our research is that the new theory goes very well with the whole idea of ​​impact. "

After spending millions of years" stuck ", the smaller moon embarked on a collision course with his older sister, bumping slowly . on it at a speed of less than three kilometers per second - slower than the speed of sound in rocks

Dr. Jutzi said it was an accident at low speed: "it was a collision in soft around 2.4 kilometers per second; less than the speed of sound -. that's important because it means that no major shocks or melting occurs

At the time of the smash, the largest moon would have had a "magma ocean" with a thin crust on top.

scientists argue that the impact would have resulted in the accumulation of material in the lunar crust and would have redistributed the magma underlying toward the near side of the moon, an idea supported by observations from the Lunar Prospector spacecraft NASA.

in a commentary, Dr. Maria Zuber, of the Institute of technology of Massachusetts (MIT) in Cambridge, USA, suggests that while the new study "demonstrates the plausibility rather than proof" they "raise the legitimate possibility that after the giant impact our Earth perhaps fleetingly possessed more a moon. "

researchers believe that one way to prove his theory is to compare their models with detailed internal structure of the moon by the Lunar Reconnaissance Orbiter is obtained from the NASA.

They are also looking at high resolution set gravity mapping to take place next year by the Laboratory mission Recovery and Interior gravity (GRAIL).

However, according to Dr. Jutzi scientists prefer to lay their hands on samples of the hidden face of the moon to test his theory.

" We hope that in the future, a sample return or manned mission would certainly help to say more about which theory is more probable "

Source:. BBC

"Earth may once have had two moon", article source: riseearth.com

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