PIA11362: Dark Rays on Mercury
Target Name: Mercury
Is a satellite of: Sol (our sun)
Mission: MESSENGER
Spacecraft: MESSENGER
Instrument: MDIS - Narrow Angle
Product Size: 1018 x 1024 pixels (width x height)
Produced By: Johns Hopkins University/APL
Full-Res TIFF: PIA11362.tif (1.044 MB)
Full-Res JPEG: PIA11362.jpg (169.8 kB)

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Original Caption Released with Image:

When a meteoroid strikes the surface of a planet, material from the surface is ejected outward at high velocity, often creating rays that extend over distances far greater than the size of the crater formed by the impact. During MESSENGERís second Mercury flyby, MDIS captured images of impressive rays on Mercury, such as the ejecta prominent around Kuiper crater (PIA11355) and the extensive ray system associated with a newly imaged crater in Mercuryís northern latitudes (PIA11356). In both of those examples, the rays appear bright, which is characteristic of freshly pulverized rock and indicates that the rays are younger than much of Mercuryís surface. In contrast, in the upper portion of this NAC image, a set of dark rays is seen emerging from a small crater. Dark rays are rare on Mercury, but other occurrences have been identified, such as at Mozart crater (PIA11024) imaged during MESSENGERís first Mercury flyby). Mozart crater is interpreted to have excavated dark material from depth during the impact event, creating dark streamers. The dark rays from the crater shown here may have a similar origin, and color imaging from the Wide Angle Camera (WAC) gathered during the flyby is being used to explore the nature of these unusual dark rays further.

Date Acquired: October 6, 2008
Image Mission Elapsed Time (MET): 131773885
Instrument: Narrow Angle Camera (NAC) of the Mercury Dual Imaging System (MDIS)
Resolution: 520 meters/pixel (0.32 miles/pixel)
Scale: The top of this image is about 530 kilometers across (330 miles)
Spacecraft Altitude: 20,000 kilometers (12,000 miles)

These images are from MESSENGER, a NASA Discovery mission to conduct the first orbital study of the innermost planet, Mercury. For information regarding the use of images, see the MESSENGER image use policy.

Image Credit:
NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Image Addition Date:
2008-10-12