Cassini Shows Close Up of Iapetus
dazza101 writes "The Cassini spacecraft passed within 72,000 kms of the Saturn moon Iapetus yesterday, taking a series of spectacular images of this intriguing moons rugged surface. An excellent prelude to what promises to be one of the major stories of the new year, the plunge of the Huygens probe into Titan's atmosphere on January 24."
In 2001: A Space Odyssey, Clarke described Iapetus as having a black circle painted on it, with a white circle within.
When one of the Voyager probes photographed Iapetus, a "circular" black area was found with a smaller white area within.
Why is this interesting? 2001 was published in 1968. The Voyager probes didn't visit Jupiter until 1980 (V1) and 1981 (V2).
That's right. All your base.
Another feature I'm quite curious about is this globe-spanning ridge. I haven't seen any mention of it anywhere yet.
It seems (though I may be wrong) to sit dead-center on the darkened portion of the moon and span much of the length of the dark part as well. Is there a connection perhaps? I'd be interested in the opinions of any planetary astronomers.