Opportunity Rover Spots Greeley Haven on Mars
Image Credit: Mars Exploration Rover Mission, Cornell, JPL, NASA
Lucius Fox
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High Cliffs Surrounding Echus Chasma on Mars
Credit: G. Neukum (FU Berlin) et al., Mars Express, DLR, ESA
Mimas drifts along in its orbit against the azure backdrop of Saturn’s northern latitudes in this true color view. (via NASA Jet Propulsion Laboratory)
Flowing Barchan Sand Dunes on Mars
Image Credit: HiRISE, MRO, LPL (U. Arizona), NASA
Moon and Mars
Credit & Copyright: John Harms
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Two Moons In Passing
In the image: Animation of Tethys passing in front of Dione from Cassini’s point of view.
Saturn’s moon Tethys passes in front of its slightly larger sister Dione in this animation made from 25 raw images acquired by Cassini on March 14, 2012. Pretty cool!
Tethys and Dione are similar in diameter, being 1,062 kilometers (660 miles) wide and 1,123 kilometers (698 miles) wide, respectively. Both are heavily cratered, ice-rich worlds.
In this view, Tethys’ enormous Odysseus crater can be seen on its northern hemisphere. 400 km (250 miles) across, Odysseus is two-fifths the diameter of Tethys itself, suggesting that it was created early in the moon’s history when it was still partially molten — or else the impact would have shattered the moon apart entirely.
The more extensively-cratered trailing side of Dione is visible here, its signature “wispy lines“ rotated out of view. Since it makes sense that a moon’s leading face should be more heavily cratered, it’s thought that Dione has been spun around by an impact event in the distant past.
If you look closely, a slight rotation in Tethys can also be discerned from the first frame to the last.
Credit: NASA/JPL/SSI. Animation by Jason Major.
Steep Cliffs on Mars
Credit: G. Neukum (FU Berlin) et al., Mars Express, DLR, ESA
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