|As the long-lasting and spectacularly successful Cassini mission to Saturn winds down, its controllers are getting more daring.
Today, on a very low, very fast pass, Cassini will fly directly through a geyser plume erupting from Saturn's moon Enceladus.
The plume is thought to consist of salt water spray from a warmish ocean hidden beneath the moon's icy crust--- but that's what today's surface-skimming flyby will try to find out.
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