June 15, 2004
Images of Phoebe, a moon of Saturn, support the idea it is a captured comet.
NASA has more on the Cassini-Huygens mission on-line including an animation of Phoebe here. Next up: Saturn by the first of July and an astonishing passage as the spacecraft crosses through the large gap between the F Ring and G Ring.
Because the rings are bright, they must be made of chunks of icy material; because the rings are so thin, the chunks must be small, no more than a couple of meters across at most, and frequent collisions between ring particles would tend to break big chunks into smaller ones. In fact, little moonlets may constantly form and be broken apart. Cassini should be able to watch this happen.
And then... The Blue Revolution has more...
Posted by Ghost of a flea at June 15, 2004 05:41 AM
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Gratuitous spam alert: I wrote a big-ass entry on my blog on the history of US planetary exploration, particularly about how Cassini is sort of the coelacanth of NASA probes, literally a "blast from the past".
But yah, fun stuff happening at NASA. Good to see unmanned planetary missions on the upswing again: I wasn't even born in the last great era of planetary exploration.
Posted by: Kelvin at June 15, 2004 10:53 AM