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By monitoring auroral activity on exoplanets, we may be able to infer the presence of water on or within an exoplanet, now, it's not going to be easy — it's not as easy as Ganymede and Jupiter, and that wasn't easy. It may require a much larger telescope than Hubble, it may require some future space telescope, but nevertheless, it's a tool now that we didn't have prior to this work that Joachim and his team have done.