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Readers will recall that last year, we were looking at science writer Matt Williams’s analysis of the various reasons that we do not see extraterrestrials except at the movies. (See the links below.) Last time out in November, we looked at the Transcension Hypothesis: The extraterrestrial intelligences exist—but after a Singularity, they became virtual intelligences, exploring inner space at an undetectably small scale. Williams has reported since then on some additional hypotheses so this week we look at a more conventional approach — the “Ocean Worlds” Hypothesis, that icy planets may have interior oceans that harbor life:

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