History of asteroid collisions reconstructed

History of asteroid collisions reconstructed

Submitted by alvin on Fri, 2016-06-03 11:11 Washington DC: A team of researchers has revealed that asteroids have endured a multitude of impact strikes since their formation 4,565 million years ago.Scientists reconstructed a timeline of these collisions using a physics-based model, which reproduces the process through time, comparing its results with present-day information about chondrite meteorites.According to them, the size distribution of the objects that make up the asteroid belt between Mars and Jupiter indicates that these asteroids have been struck by projectiles of over 20 centimetres in size at least 100 million times. The resultant craters from these strikes are proportional to both the diameters and the velocities of these projectiles.The information compiled on ordinary chondrites indicates that these meteorites originate from small asteroids which, with a diameter of less than a few hundred kilometres, collided, giving rise to these rocks millions of years ago."Our work allows us to make fundamental predictions on the extent of breaking up from collisions, or the level of alteration by strikes due to impacts, which the huge majority of asteroids have experienced. It also explains the observations of the degree of alteration by strikes which appear in those chondrites which reach Earth," noted Josep Maria Trigo.The work appears in the Astrophysical Journal. (ANI)