The Hayabusa-2 spacecraft bombed the asteroid Ryugu in April. Analysing the crater it left behind suggests Ryugu is a relative youngster at 9 million years old
Source:
https://www.newscientist.com/article/2237974-bombing-asteroid-ryugu-reveals-it-is-a-spritely-9-million-years-old/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home