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Prometheus Close Up

3 Mar 2010, 19:34 UTC
Prometheus Close Up
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From time to time this blog has wondered about Black Holes within our solar system. From deep within Saturn's Ring system, our Cassini spacecraft has captured the closest views yet of the mysterious moon Prometheus. Prometheus and Pandora are called shepherd moons because they appear to hold F Ring in place. At one time the Rings were thought to exist inside a mathematical "Roche Limit." Outside this limit moons could form, and inside they would break up tidally to form Ring fragments. Prometheus has a density of barely 0.27 g/cc, barely 1/4 that of liquid water. It is odd that objects with a density less than liquid exist inside the Roche Limit, within which liquid objects are not supposed to exist at all. Prometheus leaves big gaps in the F Ring, causing particles to spiral toward the moon in tight strands. The spiralling strands are indicators of a magnetic field. Presence of a magnetic field from a tiny moon would be indication of a singularity. If Prometheus' 10^17 kg mass contained a 10^11 kg singularity, the moon would not collapse. Presence of a singularity would hold Prometheus together within Roche's Limit. The singularity would rotate within Prometheus, powering the moon's ...

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