Monday may get half run by asteroid
Friday, April 24, 2009
The moon is billions of years ago may get a half-turned towards the earth by the impact of a large asteroid. That physicists have discovered Paris.
The researchers at the Geophysical Institute of Paris (IPGP) studied the age and size of 46 craters on the lunar surface, which are formed by flying debris in space.
According to computer calculations, the majority of craters on the western hemisphere of the lunar surface.
The body lays down an orbit around the earth in a westerly direction, making the west more often in collision with asteroids. The north side of the moon is always directed to the earth.
The researchers came to their study, however, surprising findings, reports the British magazine New Scientist.
The youngest craters on the moon they were indeed on the west side. But strangely found a lot of the older craters precisely in the northern hemisphere. This suggests that there used more meteorite impacts have occurred on that side.
The scientists report their findings may be explained by a rotation of the moon, possibly billions of years ago, under the influence of a meteorite impact.
If their theory is true, the west side of the moon to the earth previously addressed. The north side would be in the opposite direction when stressed and in collision with debris in space.
"The simplest interpretation of our observations is that one of the impacts is then ensured that the axis of the Moon finally rotated 180 degrees, so write principal investigators Mark Wieczorek and Matthieu Le Feuvre in their study.
The process by which the moon turned a half-stroke, in practice about ten thousand years have lasted.
According to the researchers, there are a few Monday craters could be formed by an asteroid large enough to the moon in balance. Samples from these craters suggest that a possible rotation of the Moon about 3.9 billion years ago should be put in motion.
Translated version of http://www.atlantis2012.com/component/content/article/58-planeten-a-kometen/269-maan-mogelijk-halve-slag-gedraaid-door-asteroide