: Astronomie: Phoebe

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Phoebe

Phoebe is one of the outer moons of Saturn; it is also known as Saturn IX. Phoebe rotates once every 9 hours or so during each orbit of 550 days so that unlike Saturn's other moons (with the exception of Hyperion) it doesn't always show the same face toward the planet. It is dark, quite red, resembles in appearance the common class of carbonaceous asteroids, and is almost certainly a captured asteroid. According to one idea, the dark material on the leading hemisphere of Iapetus may have originated on Hyperion and been dislodged by micrometeorite impacts. Phoebe is probably the source of the material contained in the enormous infrared-emitting discovered around Saturn in 2009 and within which Phoebe orbits. (Encyclopedia of Science, by David Darling, https://www.daviddarling.info/encyclopedia/P/Phoebe.html)

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