SUMMARY: Cassini has uncovered two new mini-moons of Saturn, orbiting between Mimas and Enceladus. The new moons have been dubbed S/2004 S1 and 2/2004 S2, and scientists estimate that they're approximately 4 km (2.5 miles) in diameter. They were detected using automated software that scans through images taken by Cassini to look for moving objects. Scientists have two theories about moons this small: they could have survived since the formation of the Solar System, or they could have formed more recently by particles from Saturn's ring accumulating together.

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