Waterworlds: the search for life in the outer solar system

It is thought that one or more of the icy moons of the outer solar system could support life.
Credit: NASA Planetary Photojournal

(My first article for AmericaSpace, republished here.)

Until relatively recently, it was thought that the best, or perhaps only, place to look for life elsewhere in the solar system was Mars. The other inner planets were much too hot while the outer gas and ice giants were far too cold – the chances of any kind of life being found, even microbes, was considered extremely unlikely at best.

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