Astronomy magazine podcast: The Extraterrestial Life Debate
Author Michael Crowe discusses his book and how humanity has viewed the existence of life beyond Earth.
Published:
July 17, 2008 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.
Photo by A. Fruchter (STScI) et al. / WFPC2 / HST / NASA
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