Violent collision shaped into Vesta

The new model is based on computer simulations of collisions between asteroid Vesta separated and a couple of rocks from 32 km in diameter in the last billion years. The results suggest that cosmic impacts caused Vesta's crust to melt and then re-form, with its thicker crust than can be explained by typical rock layers, the scientists said.

Collisions carved two large impact craters on the surface of Vesta. The oldest, Veneneia, formed about 2,000 million years. With a diameter of 395 km, the crater covers nearly three quarters of the diameter of Vesta Ecuador. Covering 90% of the diameter of Vesta, is one of the largest craters in the Solar System.

In Mercury's polar craters found vast reserves of water

The American space survey Messenger has confirmed the existence of water ice in deep craters at the north pole of Mercury.

"It must be the last thing you might expect from the nearest planet to the sun - is water ice. But due to the low inclination of Mercury craters near the poles are in the shade all year, and there is extremely cold, "- explained Matthew Sigler's Jet Propulsion Laboratory NASA.