On today’s episode, we talk to Dr. Ian O’Neill about the Mars Insight mission and what we’ve learned so far from scouring Mars with our latest generation of robots. We also talk about the basics of planetary science, how we know what’s inside different types of planets, and the future of exploring our solar system. And, of course, we also touch on the search for life in our own cosmic backyard. Can you even do an episode about space without mentioning some hypothetical little green microbes?