S1E2: When the Map Is Wrong

In 2013, a group of scientists sat down to redraw the habitable zone using better physics and better data, and when they finished, something unsettling had happened. Earth — our one confirmed living planet — was suddenly right at the edge. This episode is about what happens when a "settled" scientific concept gets unsettled. And about a second finding, hiding in the same recalculation, that quietly changed the question the field was really asking.

S1E1: The Zone

Three rocky planets orbit our Sun in the region where liquid water could exist, but only one of them is alive. For fifty years, astronomers have chased a single elegant idea about what makes a world habitable — a range of distances from a star where the temperature is just right. In this episode, we trace the "habitable zone" from a thought experiment to the calculation that still defines the field today, and find a warning hiding in plain sight. Even the scientists who built the concept knew it wasn't quite the answer everyone thinks it is.

S1E2: Paradise Lost

Venus today is a world of crushing heat and acid clouds, but the evidence written in its own atmosphere suggests it wasn't always that way.