Shortly after the Big Bang, space was densely packed with enough stuff for sound to travel through it. What was producing sound in this era, and how can we hear it today?Todays episode is sponsored by the International Space Station. Join the ISS National Laboratory this August in Seattle at the 12th annual ISS Research and Development Conference. Visit ISSconference.org to register now.Support the show

Special guest Cari Cesarotti tells us why so many particle physicists are itching to build a whole new type of particle collider.Support the show

Exploring the wrong theories that came before the Big Bang, the impact of general relativity on our understanding of the universe, Paul Dirac's theory on gravity, the evolution of the Big Bang theory, and the significance of studying inflation and its alternative theories in the history of science.

Can consciousness be explained by physics, or does it appeal to something beyond materialism? Philosopher guest star David Chalmers talks to us about how we can think about consciousness from a philosophical and scientific perspective.To support our show and get ad-free episodes and other exclusives, join us for $3 a month on Patreon: https://patreon.com/whythisuniverseSupport the show

A whirlwind of questions brings us to an odd conclusion: could reality be an illusion created by a quantum fluctuation of a brain? This is a rebroadcast of a past favorite.For ad-free episodes and other exclusives, join us for $3 a month on Patreon: https://patreon.com/whythisuniverseSupport the show

Astronomers' newest telescope, JWST, just discovered galaxies that formed earlier than previously thought possible. What does this discovery mean for our understanding of the early universe?To support our show and get ad-free episodes and other exclusives, join us for $3 a month on Patreon: https://patreon.com/whythisuniverseSupport the show

Before the LHC turned on in 2008, many feared that it would create a dangerous black hole that would destroy the world. Were any of those fears well-founded, and how seriously did scientists take these claims?Support the show

Learn how extra dimensions of space might appear to us, and what physicists have done to try to find them.To support our show and get ad-free episodes and other exclusives, join us for $3 a month on Patreon: https://patreon.com/whythisuniverseSupport the show

Special guest Katie Mack talks to us about how the universe might end.To support our show and get ad-free episodes and other exclusives, join us for $3 a month on Patreon: https://patreon.com/whythisuniverseSupport the show

In today's different type of episode, we talk about the risks of a subtle kind of scientific misinformation.Support the show