美国宇航局月球侦察轨道器（LROC）拍摄月球高清图片
本帖最后由 skyczheng 于 2009-10-22 19:01 编辑出自： http://lroc.sese.asu.edu/
我英文不好，还是自己翻译看看吧！都是新更新的图片！
Caption:High-albedo marks on the lunar surface left by a boulder bouncing downthe northeast wall of farside highlands crater Moore F. Image width is610 meters
Impacts can cause both subtle and profound changes to the lunar surface.
In this subarea of LROC NAC frame M110383422R, you see the trail of asmall (3 meter diameter) boulder that after getting dislodged (probablyby a small meteorite impact) bounced down the northeast rim of Moore F,a 25 km diameter crater located in the farside highlands.
What is interesting about this scene is that as the boulder bounceddown the rim, its contact with the lunar surface kicked up and sprayedfresh, high-albedo highlands material outwards, leaving a clear trailat least part of the way down the rim of Moore F.Fresh, high-albedomaterials on the lunar surface darken over time as they are exposed tothe space environment.A key question in lunar geology is how fastdoes this space weathering process take?
Does it take hundreds of millions or just millions of years for a surface to mature and darken?Do very thin deposits mature faster than thick deposits (think ejecta vs. rays).
Answering that question will have important ramifications for ourgeologic interpretations elsewhere on the lunar surface.Having futurehuman explorers of this region collect samples of these high-albedosoils would provide useful information about the timescale of the spaceweathering processes. 中间的灰色线是什么呢？ Fresh crater on the southwest rim of Metius B crater.
LROC NAC image width is 740 meters
，M104670019LM107035386L
Onthe left, the morphology of this small mare crater (200 m diameter) isclear, whereas in the image on the right differences in brightness(reflectance or albedo) are highlighted defining ejecta patterns. Explorers might prefer the low-Sun image for landing or planning traverses, while the high-Sun image guides the eye to ejecta. Oneof the strengths of the LRO mission is that it passes over the sameregion numerous times, and each time the Sun angle is differentallowing LROC to build up an image set over a wide range of angles.
This crater also illustrates the influence of pre-existing regolith (soil) structure on crater morphology. When the regolith is relatively thin, over more-or-less intact bedrock, small craters often do not have a simple bowl shape. Thiscrater is filled with rubble and there are numerous blocks up to 10 min diameter scattered around the rim and the interior, indicating thatbedrock was excavated during the impact. Incases where impacts occur in a thick regolith, the crater does notexcavate blocky rocks but rather fine-grained soil, resulting a nicelydefined bowl shape. 本帖最后由 skyczheng 于 2009-10-22 18:57 编辑
LROC NAC image width is 740 meters
Thisis a relatively small (440 m diameter) unnamed crater on the southwestrim of Metius B, which itself is a 14 km diameter crater on the floorof Metius, an 88 km diameter crater in the southeast highlands on thelunar nearside. Some post-impact modifications to this crater are readily apparent.。 Althoughthe crater itself is circular, you can see that the materials insidethe crater slumped towards the downslope side of the crater followingthe impact. Thereare also numerous boulder trails emanating from around this very freshcrater, created when the rocks strewn outwards by this impact eventlanded on the slope and began rolling towards the bottom of Metius B.
Eventhough the Moon may not seem like a terribly dynamic environment, inactuality impacts still occur on a fairly regular basis. Oneof the critical goals of the LROC scientific investigation is toprovide the necessary information to quantify the recent impact rate,providing a key data point for designers of future lunar habitats。LROC Some of the trails are smooth and nearly straight while others are curvy or gouge into the surface.Inmany cases by following a boulder's trail you are led back to its pointof origin, useful information for a future geologist sampling otherwiseunreachable points. Imagewidth is 600-m across, north is up, and the boulder in the lowerleft-hand corner is 15-m across, unnamed 15-km diamater cratersouthwest of Rowland crater
Crateris located on the northeastern rim of the eroded (pre-Nectarian) craterHommel at -52.9° N and 34.6° E. Image width is 600 meters and north isup, 0.6 m/pixel resolution
Image width is 520 m 漂亮，欣赏支持 本帖最后由 kson 于 2009-10-23 18:18 编辑
::070821_13.jpg::貌似一片海滩，还有小贝壳爬过::42:: 太高清了 打开都很慢 ::42:: 一个一个小突出难道是月球上的小山坡吗 你们仔细看，明显可以看到图片有的石头有运动的轨迹，请问下这是为啥？流星？？？风？？？？人工搬的？？？？::070821_11.jpg::
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