The Hercules Globular Cluster (or M13) was famously the target for a message intended for alien civilisations… But it is an unlikely place to find life-friendly planets.

Quite a large cast in this video, so see our cast page at:

Image contributors included:
Michael Siniscalchi:
Fred Espenak:

Deep Sky Videos website:
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Videos by Brady Haran
Additional filming and editing in this film by Stephen Slater