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When resources (including time) are limited for a full coverage of the Moon (in this case), you must choose between many high-resolution photos or few lower resolution photos.
Originally posted by spikey
Given that, can anyone explain to me, why Japan sends it's first probe to the moon with a camera capable of resolving down to 10 meters per pixel, when older probes have carried camera that can achieve a 20 times that resolution?
Lunar Reconnaissance Orbiter Camera The Lunar Reconnaissance Orbiter Camera (LROC) will retrieve high resolution black and white images of the lunar surface, capturing images of the lunar poles with resolutions down to 1m, and will image the lunar surface in color and ultraviolet. These images will provide knowledge of polar illumination conditions, identify potential resources & hazards, and enable safe landing site selection.
The cameras they use do not have zoom, the resolutioni changes with the altitude at which the probe flies over the target, so to have a higher resolution at the same orbit (a lower orbit would be very difficult of even impossible to sustain for months) they need a more powerful lens, something like the difference between a consumer camera and those huge lens we see on sports events.
Originally posted by smurfy
I don't understand about the heavy lens bit however.
Originally posted by CaptChaos
Ever notice how ALL the craters on the Moon are PERFECTLY ROUND? An impact would have to be exactly perpendicular to create a round crater. If it strikes the surface at any angle other than 90 degrees, it will make a more or less oval shaped crater. Yet somehow you cannot find even ONE oval shaped crater on the Moon.
In order to better understand the crater forming process, scientists fired miniature asteroids into lunar-like targets. Real asteroids hit the Moon at fantastically high speeds, greater than 16 km per second (or 35,000 miles per hour). The vertical gun facility at the NASA Ames Research Center provided the best opportunity to simulate these high-energy events. One type of experiment involved tilting the gun at a very steep angle. As the angle of impact got steeper and steeper, scientists saw no change from the typical circular crater. Finally, when the angle was grazing (or less than 15° from the horizon) elliptical, rather than circular, craters formed. Additional ray patterns were seen to spread out like butterfly wings at these extreme impact angles. The high-velocity gun experiments led scientists to the hypothesis that Messier formed as a result of a low-angle impact.
Originally posted by ArMaP
The cameras they use do not have zoom, the resolutioni changes with the altitude at which the probe flies over the target, so to have a higher resolution at the same orbit (a lower orbit would be very difficult of even impossible to sustain for months) they need a more powerful lens, something like the difference between a consumer camera and those huge lens we see on sports events.
Originally posted by smurfy
I don't understand about the heavy lens bit however.