Art Bell welcomes Sean Carroll, senior research associate in physics at the California Institute of Technology, for a conversation about cosmology timed with the landmark discovery of Earth-like exoplanet Gliese 581c. Art opens with extensive coverage of this newly found world just 20.5 light years away, describing its Earth-like temperatures, potential for liquid water, and the possibility it could harbor life far older than our own given its ancient host star. Carroll explains how astronomers… Full show notes & guests: https://artbellarchive.org/episode/april-28-2007-our-universe-sean-carroll