Found new research, that twenty five percent of lunar craters can store the remains of asteroids, which created them.
The surprising result allows to assume that it is necessary to scientists a little more difficult, than they expected to find out, from what the Moon consists. By the words of coauthor of research Jay Melosh from University of Pardyyu future researches of structure of the lunar soil should work to prove that breeds on a surface really lunar, instead of arose owing to falling of the asteroids, especially unusual or exotic minerals.
Melosh and his colleagues used computer models for imitation of formation of lunar craters from collision with asteroids. They defined that one quarter of craters on the Moon were left the asteroids flying with a speed of 26 800 miles/h (43 130 km/h) or less – improbably quickly, but not quickly enough that the asteroid was destroyed. Other calculations executed by team, show that at such speeds the asteroid doesn’t evaporate, and many its parts remain in the formed crater. If diameter of a crater not less than 20 kilometers, the remains of an asteroid tend to collect in the central dive of a crater, gradually collapsing under the influence of gravitation of the Moon.
Results of new research can explain emergence of minerals of shpinel and olivine the central dive of big lunar craters, for example in 93 km Copernicus. Spinel and olivine are widespread on many asteroids, so it is quite possible that these and other minerals, which according to assumptions of scientists were natural on the Moon, and actually were transferred from the fallen asteroids.