Are we alone? Astronomical observations over the last few years indicate that environments suitable for life are probably plentiful in the universe. World-renowned astronomers tackle this compelling question during the "Tour the Cosmos" Web simulcast.

On this show, Marc Steiner's guests include Chris Burrows, Space Telescope Science Institute; Jim O'Leary, Maryland Science Center; Steven Squyres, Cornell University; and Mark Voit, Space Telescope Science Institute.

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