OSIRIS‑REx found a boulder‑covered Bennu

NASA's OSIRIS-REx mission went to asteroid Bennu expecting sandy soil and found a rock quarry instead. In this episode, AstroForge senior payload scientist and former Lead Scientist on OSIRIS-REx's sample physical and thermal analysis working group, Andy Ryan, joins Jack to discuss what the team actually found, why it was so radically different from what was expected, and what it might mean for mining a metallic asteroid. Plus; planetary defense, porosity, and lock-in thermography!