Vesta is the 2nd-largest Asteroid in the well known asteroid belt between the orbits of Mars and Jupiter.  525 Km in diameter, it is very big for an asteroid.  If it was much bigger we would call it a dwarf planet. The Dawn Spacecraft, launched in 2007, stopped by Vesta in 2011 and stuck with it until 2012 as it orbited the sun.  We are still seeing the results of that rendezvous, and just recently NASA released a complete map of the surface features of Vesta. It’s amazing to see so many interesting surface features on such a small world.  Geologic...