Analysis of the Cassini data shows that plumes coming from Enceladus contain proteins that could easily turn into amino acids.
I've already talked to scientists who actually think Enceladus, not Titan or Europa, is the best place to look for alien microbes (We're not expecting to find anything more due to the low amounts of energy available). And that those plumes are part of why - no need to drill through the ice.
Unfortunately, and I blame Stanley Kubrick, people are more interested in Europa. "All these worlds are yours" and all that.
But Enceladus may teach us a lot about how life starts. Or even doesn't start.
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