SPACE - The anatomy of an asteroid: Asteroids can have a highly varied internal structure

ESO’s New Technology Telescope (NTT) has been used to find the first evidence that asteroids can have a highly varied internal structure. By making exquisitely precise measurements astronomers have found that different parts of the asteroid Itokawa have different densities. As well as revealing secrets about the asteroid’s formation, finding out what lies below the surface of asteroids may also shed light on what happens when bodies collide in th ...

http://www.sciencedaily.com/releases/2014/02/140205075813.ht