We have known about Comet 3I/ATLAS for just over four months, and astronomers across the world have been giddy with excitement. This is only the third known interstellar object to have crossed the Solar System, among the thousands that should be here every day. Researchers have been using many different observatories to study this comet, and soon it will be the turn of one unlikely mission. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

That mission is the European Space Agency’s JUICE , and it is going to be revolutionary. It involves an interplanetary spacecraft whose goal is to study the icy moons of Jupiter: Ganymede, Callisto, and Europa. It will characterize the interior of these worlds, which are likely to hide a liquid ocean

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