Astronomy Picture of the Day

Iapetus: 3D Equatorial Ridge

Bild Note: 2.5 (2 Votes)

⏴ previousBild Upload von 18.02.2016 21:43next ⏵
#103318 by @ 16.09.2007 00:00 - nach oben -
Iapetus: 3D Equatorial Ridge


This bizarre, equatorial ridge
extending across and beyond
the dark, leading hemisphere
of Iapetus gives the
Saturnian moon
a distinct walnut shape.

With red/blue glasses you can check out a
remarkable stereo composition of this extraordinary feature -- based on
close-up images from this week's Cassini
spacecraft flyby.

In fact, the ridge's combination of equatorial symmetry and scale,
about 20 kilometers wide and reaching up to 20 kilometers above
the surface, is not known to
be duplicated anywhere else in our solar system.

The unique feature was
discovered in Cassini images
from 2004.

It appears to be heavily cratered and therefore ancient,
but the origin of the
equatorial ridge on
remains a mystery.

Credit & Copyright