Stereo Image Gallery

This web page presents stereo images of a number of anomalous features on the moon. Stereo (3-D) images are produced from two views of the surface taken at different locations in space. To see the images in 3-D, look away from screen and focus at a point in the distance. Then shift your gaze to the screen without focusing on it. You should see three images. Concentrate (but don't focus) on the middle image, and try to bring different parts of the view into correspondence. With a little practice, you should be able to see the middle image in stereo.

"Organ Pipe" -- Obtained by combining two adjacent and partially overlapping Clementine [1] images, LUE50467 and LUE50498. These images were taken by the UV/VIS camera during orbit 218 using the 1000 nm filter. They were taken between 12:58:58 and 14:04:21 GMT on April 6, 1994. The longitude is approximately 225 degrees and is on the far side of the moon. The feature of interest is a series of 6 or 7 pits arranged in a line, oriented more or less horizontally, about 1/3 up from the bottom of the picture, resembling an organ pipe. Although rilles (long, narrow trenches) and crater chains can have the same general appearance, the pits in this photo are elevated with respect to the background.

"Web" -- Obtained by combining images, LUE50467 and LUE50498, acquired a short time later in the same orbit on the far side of the moon. There is an overall impression of grooves running roughly from the upper left to the lower right of the picture. In stereo it also appears as if the top of a hill just above and right of center has been chiseled out to reveal a hexagonal or octagonal pattern resembling a web or radar dish. These patterns may be the result of viewing an extremely rough surface at a very low sun angle.

"Curlicue" -- Acquired during orbit 150 on the near side (longitude approximately 48 degrees, latitude unknown). Again in this image we see a series of pits (crater chain?) in the upper half of the picture just above center. Moving along the chain from the upper left to the lower right and continuing past the last crater, a series of fine grooves emerges that sweeps down and to the left. Other grooves can be seen below and to the left. These features are enclosed by an "S" shaped pattern resembling a curlicue.

"Rays and Plume" -- (from LUE40134 and LUB40144). Rays are thought to be caused by material ejected from impact craters. A prominent display of rays emanates from this crater. These rays do not radiate uniformly in all directions (notice the gaps in the top-right, bottom-left, and top-left quadrants). Note the thin dark line (a fissure?) extending out from the shadow of the crater at 10 o'clock, and a more diffuse dark-colored feature (at 2 o'clock) 'flowing' up and out of the crater. Could this be a vapor plume of some kind?

"Circular Formation" -- (from LUE40227 and LUE40258). Clearly above ground level, this feature does not appear to be a crater at all. Rather it seems to formed out of the same light-colored material above and to the right. In stereo the two small craters to the left are clearly depressions in the surface while the circular formation is raised above the surface.

"Rectangular Depression" -- (from Apollo 10 frames AS10-32-4820 through AS10-32-4822) [2]. This area is immediately adjacent to the crater Ukert. In stereo, the visual impression is that of a rectangular area has either sunk or been excavated. Also apparent are sharp, straight features etched into the surface. There also appears to be some kind of periodic structure in the exposed rock.


[1] The Clementine mission mapped most of the lunar surface at a number of resolutions and wavelengths from ultraviolet (UV) to infrared (IR) over a two month period early in 1994. Clementine had five different imaging systems on-board. The UV/Visible camera had a filter wheel with six different filters, ranging from 415 nm to 1000 nm, and including a broad-band filter covering 400 to 950 nm. The Near IR camera also had a six-filter wheel, ranging from 1100 nm to 2690 nm. The Longwave IR camera had a wavelength range of 8000 to 9500 nm. The Hi-Res imager had a broad-band filter from 400 to 800 nm and four other filters ranging from 415 to 750 nm. The Star Tracker camera was also used for imaging. Stereo views can be constructed for the overlap region between adjacent images acquired as the spacecraft few over the surface.
[2] Original imagery was provided by Richard Hoagland.

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