Distributia
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Ian HolmHimself - Narrator (voice)
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Geoff MarcyHimself (as Prof Geoffrey Marcy)
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Lynn RothschildHerself (as Dr Lynn Rothschild)
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Frank DrakeHimself (as Dr Frank Drake)
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Seth ShostakHimself (as Dr Seth Shostak)
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Sean RaymondHimself (as Dr Sean Raymond)
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William J. BoruckiHimself
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Stephane UdryHimself (as Prof Stephane Udry)