Part 1 of a discussion between astronomers about the video Habitable Zone: Goldilocks Paradox. How can an exoplanet be at the right temperature but still not have liquid water? If we want to find an exoplanet that could host life like us, why does it matter what that planet is made of? Find out more about the science behind the search for a habitable exoplanet in the episode The Habitable Zone: Goldilocks Paradox.