Time: 11:00 h
Author: Michele Bannister
The small bodies of planetary systems record how their systems formed and evolved. Major observational surveys are providing new insight into the intricate, complex dynamical structure of the populations that exist in the Solar System, with hints at new, barely-seen populations. Together with colour measurements of their surfaces, it is finally possible to start piecing together the original compositional structure of our protoplanetary disk. Observations of the first interstellar object 1I/`Oumuamua show this visiting planetesimal has many curious properties, with kinship to the tiny worlds in our own system. Its 10^26 cousins wandering the Galaxy are part of an overarching cycle of planetesimal formation and scattering over billions of years.