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Astronomy magazine podcast: The Extraterrestial Life Debate

Author Michael Crowe discusses his book and how humanity has viewed the existence of life beyond Earth.
Galaxy Cluster Abell 2218
The Abell 2218 galaxy cluster is about 3 billion light-years away in the constellation Draco the Dragon. The cluster is so massive and compact it bends the light of more distant galaxies, producing distorted, arc-shaped projections seen in this Hubble Space Telescope image.
A. Fruchter (STScI) et al. / WFPC2 / HST / NASA
July 18, 2008

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