Could there be a planet lurking at the edge of our Solar System that we haven’t discovered yet? Maybe! It’s happened before. In this talk, Larissa Markwardt explains how the orbits of objects we already know about in our Solar System can be used to infer the existence of yet unseen planets. Larissa also discusses the history and science of the discoveries of Neptune and Pluto, searches for other hypothetical planets (Planet X and Vulcan), and the current hunt for Planet 9. 

About Larissa: 

Larissa is a PhD candidate in Astronomy and Astrophysics and NSF graduate research fellow at the University of Michigan. She studies tiny, faint, and distant space rocks in our Solar System, specifically Earth Trojans and Kuiper Belt Objects. In her free time she likes to go hiking and kayaking, play board games, and watch Stargate. Find her on Twitter @LarMarStar.