We’ve discovered thousands of exoplanets, but what about exomoons? Astronomer David Kipping joins Brian Greene to explore the ongoing search for exomoons—lesser-known, but intriguing potential habitats for life beyond Earth.

How confident are we that most matter in the universe has so far escaped detection? And if there is dark matter, might there be dark stars and even a dark big bang? Leading physicist Katherine Freese joins Brian Greene to explore these dark matters.

How fast is the universe expanding? Two prominent approaches are finding different answers, propelling cosmology toward a crisis. Wendy Freedman, a renowned astronomer who has spent decades seeking the expansion rate, joins Brian Greene to discuss the latest thinking on this so-called Hubble Tension.

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