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[تصویر:  13493017461.png]





Bathurst Inlet' Rock on Curiosity's Sol 54, Context View
NASA's
Mars rover Curiosity held its Mars Hand Lens Imager (MAHLI) camera
about 10.5 inches (27 centimeters) away from the top of a rock called
"Bathurst Inlet" for a set of eight images combined into this
merged-focus view of the rock. This context image covers an area roughly
6.5 inches by 5 inches (16 centimeters by 12 centimeters). Resolution
is about 105 microns per pixel.

MAHLI took the component images
for this merged-focus view, plus closer-up images of Bathurst Inlet,
during Curiosity's 54th Martian day, or sol (Sept. 30, 2012). The
instrument's principal investigator had invited Curiosity's science team
to "MAHLI it up!" in the selection of Sol 54 targets for inspection
with MAHLI and with the other instrument at the end of Curiosity's arm,
the Alpha Particle X-Ray Spectrometer.

The Bathurst Inlet rock
is dark gray and appears to be so fine-grained that MAHLI cannot resolve
grains or crystals in it. This means that the grains or crystals, if
there are any at all, are smaller than about 80 microns in size. Some
windblown sand-sized grains or dust aggregates have accumulated on the
surface of the rock but this surface is clean compared to, for example,
the pebbly substrate below the rock (upper left and lower right in this
context image).

MAHLI can do focus merging onboard. The
full-frame versions of the eight separate images that were combined into
this view were not even returned to Earth -- just the thumbnail
versions. Merging the images onboard reduces the volume of data that
needs to be downlinked to Earth.

Image credit: NASA/JPL-Caltech/Malin Space Science Systems
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  آیا مریخ گرم است ؟! amir astronomer 0 236 02-11-2012، 01:35 PM
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