After a storied career with 5 spaceflights (including three trips to fix the Hubble Space Telescope), NASA astronaut John Grunsfeld now helms the space agency’s scientific missions. He helps shepherd …

Astronomer Jill Tarter leads the charge to search for intelligent life on other planets by listening to clues from over 40 radio telescopes. Episode filmed live at the 2010 World …

Without dark matter and dark energy, the equations of physics don’t match what we observe in the cosmos. But what if it’s not the universe that needs extra ingredients—but the …

Alien life has been a mainstay and fascination of science fiction, but who–or what–might actually be out there: biological life, artificial intelligence, or some combination of both? It took only …

Brian Greene and Nobel Laureate Brian Schmidt engage in a wide-ranging conversation covering cosmology, the accelerating universe, and the role of science in shaping our future. This program is part …

It’s an old question: What is consciousness? Today, sophisticated brain imaging technologies, clinical studies, as well as the newfound ability to listen to the whisper of even an individual nerve cell, are bringing scientists closer than ever to the neurobiological basis of consciousness.