You need to upgrade your Flash Player The theme of this blog is not only and obviously space, but in particular “terrestrial worlds”, places that tend to have surfaces on which one could walk or at least attach oneself to. These places sometimes also have other earth-like familiar features such as atmospheres, weather, volcanos, geysers and perhaps, we are finding, even exotic oceans, rivers or lakes that are not necessarily made of familiar materials we are used to here at home. The second theme is imagery. Occasionally I do some retouching of images when needed if an image is incomplete or sometimes “dirty” or noisy. I will attempt to correct image shortcomings based upon other images or well-accepted presumed attributes. When this is done, notes will be offered as to what was added, why and sometimes how it was done. This way no one should ever wonder if something they are looking at is real or photoshop.

Archive for the 'Dione' Category

Wallpaper: Dione’s Ice Cliffs at Crescent

Tuesday, April 10th, 2007

Wallpaper: Dione: Ice Cliffs at Crescent

An almost Apollo class image of the cliffs of Dione rising at its horizon. Many of the cliffs pictured here are from impact craters, but Dione is also well known for its “wispy” details which have been revealed by Cassini as fractures which result in giant ice cliffs and valleys. You can see one crater actually cross-sectioned by one of these fractures at the extreme far right side of the wallpaper image above.

The origins of these fractures are yet unknown and it is generally accepted that these are relatively recent formations as many of them run through impact craters which are known all over the solar system to be ancient details. As a matter of fact, impact cratering is how most planetary scientists are able to rate the age of a surface by the absence or presence of crater events. Bodies with many craters (our moon, Callisto and Mercury) are considered to be old and generally unchanged since early in its formation history as it is assumed that the period of heavy cratering happened soon after the formation of the solar system. Bodies with less cratering (like Earth, Io and Titan) are considered to have “young” surfaces which have been geologically changed over the ages and erased the record of impact cratering.

Wallpaper: Dione Portrait

Sunday, January 14th, 2007

Saturn’s moon Dione seen at almost full disk. Recently the “wispy” markings have been revealed to be giant ice cliffs as seen by the Cassini spacecraft after coming close to 500km from the surface. The cliffs reach as high as several hundred meters high and are thought to be the result of ancient tectonic fractures.

Image Processors on Flickr: Gordan Ugarkovic

Friday, December 29th, 2006

Gordan Ugarkovic has a great collection of reworked Cassini images on Flickr. I contacted Gordan about showing some of his images here on wanderingspace and he was ever so gracious. As many people Gordan is “somewhat underwhelmed by the frequency the Cassini Imaging Team releases color composites”, so it is up to excellent freelancers like him to compile this information from the data files which are made public by NASA. Problem is that these images rarely make it to the mass media and we are stuck with the dozen or so color images the NASA imaging teams decide to produce in a year.

Wallpaper: Europa and the Eye of Jupiter

Wallpaper: Saturn’s Rings and Three Moons

WALLPAPER NOTE: The left 1/3 of the “Three Moons” image was extended in Photoshop using data at the edges of the original image which was cropped to a square format. This “fake” imagery was only applied to that area of the rings and the rest of the image including the moons is actual.

Here are some other images from Gordan which are some of my favorites, but don’t trust my editing… go to the gallery and have a look yourself. For the sake of posterity I have added a permanent link to his gallery on the right side of this blog where you may note that there are already a few others linked. There were two additional ones but the sites have been taken down since I linked to them?! Hopefully the three left will stick around for a while and I will in time add more to the collection.

Tethys on a Hazy Limb

Tethys and Saturn’s Hazy Limb

Mimas and Promethius on Rings

Mimas and Prometheus on Rings

Io on Jupiters Edge

Io on Jupiters Edge

Wallpaper: Dione and Saturn

Saturday, November 25th, 2006

Dione and Saturn
Dione’s most notable features are the wispy streaks which are seen here in the upper left-hand side. These have been determined to be “ice cliffs” and are now thought to reveal tectonic fractures just like those known on Earth to cause earthquakes.

IMAGE NOTE: One of the best images returned from Cassini is this one of Saturn’s moon Dione passing in front of its host. Nearly hard to believe this is an actual image and not a composite. All that was added, or altered to this image was the extension of left side Saturn’s rings as they were cropped off in the square format of the original.