The spacecraft Cassini is on its last legs, but that doesn’t hinder it from making one last effort, providing us with some very interesting data about Saturns moon Enceladus.

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The spacecraft discovered hydrogen in the plume of gas and icy particles spraying from Saturn’s moon Enceladus. The discovery means the small, icy moon — which has a global ocean under its surface — has a source of chemical energy that could be useful for microbes if any exist there.