It's worth taking a tour by clicking on particular objects that will zoom in close and show each object as seen by space probes that have visited. E.g. 21Luteti

It's worth taking a tour by clicking on particular objects that will zoom in close and show each object as seen by space probes that have visited. E.g. 21Lutetia that was photographed by Rosetta in 2010 is a 90km diameter oblong rotating once every 8 hours with three separate sets of impact craters in tight groups showing the impacts in each group were likely fragments of single objects. The craters are about 10-20km across.