We may not need to leave our own Solar System to look for any sign of life outside of Earth. Icy moons could rewrite cosmic history with oceans sandwiched between an ice crust and a hot planetary core! Something unexpected happened in 2005 – while visiting Saturn, the Cassini spacecraft flew through a fine water mist. Cassini wasn’t built to sample water, but it was still encouraging for scientists to discover something like that. And it's not the only space object that could be fit for life.

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