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[Edit]: Oh how we wish we could stay and answer all of your questions. We had a lot of fun, but we all need to head off to talk about Europa later this afternoon on Capitol Hill (no livestream, unfortunately, but The Planetary Society will post a video).
And go Europa!
Hey there, Reddit. We’re here to answer anything about Europa—the moon of Jupiter that probably has more liquid water than all the Earth’s oceans combined.
Europa also seems likely to have heat energy and nutrients. Combine those all together and you’re looking at a place that could be habitable for life at this very moment. It’s like having our own little goldilocks-zone exoplanet in our cosmic backyard.
Why are we doing this? Fundamentally we all love Europa and the mysteries associated with it. What, if anything, can be found in the great oceans of Europa? How could NASA look for life? What would it mean to discover life or even to discover that there is no life there? These are compelling questions, and we’re talking about them today in a special event in D.C. We had such a strong response, we decided to talk about it on Reddit, too.
Some good Europa resources:
How big is Europa? Here is a comparison of surface areas of bodies in the solar system from Randall Monroe at xkcd