NASA每日图集20090420—26、29、30 地球日特辑

图片来源http://www.nasa.gov/multimedia/imagegallery/，后面几楼不再一一注明。本图集貌似全部与地球相关。

2009.04.21
Earthrise
在月球看地球升起

                               
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The Apollo 16 crew captured this Earthrise with a handheld Hasselblad camera during the second revolution of the moon. Identifiable craters seen on the moon include Saha, Wyld and Saenger. Much of the terrain seen here is never visible from the Earth, as the command module was passing onto what is known as the 'dark side' of the moon.
在绕月旋转的第2圈时，阿波罗16号乘员组用一台手持哈苏相机（果然不是一般货——译注）拍下了此美景——地球从月球表面升起。在照片中可以看到月球上的三座陨石坑——Saha、 Wyld和Saenger。当阿波罗飞船指令舱从月球背面飞过时，他们发现月球背面许多地形和地球有相似之处。
Apollo 16 launched on April 16, 1972 and landed on the moon on April 20. The mission was commanded by John Young; Thomas K. Mattingly II was the command module pilot and Charles M. Duke, Jr. served as the lunarmodule pilot.
阿波罗16号于1972.4.16发射升空并于4.20抵达月球轨道，飞船指令长John Young，轨道舱驾驶员Thomas K. Mattingly II ，登月舱驾驶员Charles M. Duke。

Image Credit: NASA

这是1600x1200的图

                               
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阿波罗16号拍摄的原图大小（我认为人类还是登上过月球的），3072X3070
http://www.nasa.gov/images/content/331786main_as16-120-19187_full.jpg

                               
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2009-04-22
Aracar Volcano, Andes Mountains
安第斯山的Aracar火山

                               
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Aracar volcano is one of many volcanoes in the Andes Range that is located just east of the Argentina-Chile border. Well-preserved lava flows are found at its base. Prior to a report of ash columns from the summit in 1993, the volcano was not known to be active and very little is known of the volcano's age and history.
Aracar火山位于阿根廷——智利边界东部，是安第斯山脉许多火山之一。从山顶到山脚，熔岩流保存得很完整。在1993年该火山喷发火山灰柱前，我们不知道它什么时候活动，对它的年龄和历史知道得更少。
Salars, the large whitish featuresare very common in the arid Andes. The term salar is used exclusively of the saltwater wetlands of the Puna (high Andes) and can describe not only salt lakes but also temporary marshes, shallow lakes and lagoons,or simply salt crust. The nearby Salar del Hombre Muerto is being put into mineral production. The endeavor is expected to become one of Argentina's biggest mines, producing up to 20,000 tons of lithium carbonate and lithium chloride per year, to be extracted by pumping from the area's lithium-rich saltbeds.
在干旱的安第斯山区，大片发白的盐湖是相当显著的地表特征。盐湖并不仅仅指安第斯山间高原的含盐湿地，也包括泻湖、浅的淡水湖等临时性沼泽地，甚至包括完全干涸的盐壳。附近的翁布雷.穆埃尔托盐湖正在开采矿藏，它正努力成为阿根廷最大的矿区之一，每年从富含Li的盐床中提取2万吨碳酸锂和氯化锂（LiCl）。
This image was taken from the space shuttle on Feb. 20, 2000.
本图由太空船摄于2000.2.20。（估计是某次航天飞机任务吧，否则应该说明是ISS的——gohomeman1译注）

Image Credit: NASA/JPL/UCSD/JSC

1600X1200壁纸

                               
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完整大图 3060X2036，1.2MB
http://www.nasa.gov/images/content/330060main_PIA11017_full.jpg

                               
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2009.4.23
Guinea-Bissau
几内亚比绍共和国

                               
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This Landsat 7 image of Guinea-Bissau, a small country in West Africa,shows the complex patterns of the country's shallow coastal waters,where silt carried by the Geba and other rivers washes out into the Atlantic Ocean.
美国地球资源(探测)卫星7#拍摄的西非小国——几内亚比绍共和国，图中显示了浅海处复杂的河口冲积区，泥沙等由Geba河等在此带入大西洋。
This is a false-color composite image made using infrared, red and blue wavelengths to bring out details in the silt was taken using Landsat 7's Enhanced Thematic Mapper plus (ETM+)sensor on Jan. 12, 2000.
本图是红外伪彩的，红色、蓝色分别表示海陆和泥沙分布密度（越红含量越高）。本图摄于2000.1.12，由地球资源(探测)卫星7#的改进型主题测绘仪 (ETM+)获得。
Image Credit: NASA/USGS EROS Data Center

1600X1200图

                               
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完整大图，3900X3900,3MB

http://www.nasa.gov/images/content/330946main_landsat_art_guinea_lrg_full.jpg

可见而不可亲眼所见的景象

是啊，红外伪彩很难做得逼真的，以前中国第一代遥感卫星的伪彩图像，我看了简直觉得不可忍受。现在配色多了，也相对好看了。

2009.4.24
All-American Canal
全美大运河

                               
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The All-American Canal, the largest irrigation canal in the world and a key landmark along the U.S.-Mexico border, is the focus of this image,taken by the crew of Expedition 18 aboard the International Space Station. The prominent dark line crossing the image is the canal, which is crossed in this view by Interstate Highway 8. The canal carries 26,155 cubic feet of water per second westward from the Colorado River to support the intensive agriculture of California's Imperial Valley to the northwest and nine cities, including San Diego. The canal system is the Imperial Valley's only source of water, and it allows irrigation of more than 500,000 acres of agricultural fields. The Coachella Canal,one of four main branch canals, leads water north to Imperial Valley.
本图的焦点——全美大运河是全球最大的灌溉运河，也是美国、墨西哥边界的明显地标（估计也是边界走向——gohomeman1译注）。本图由国际空间站第18批乘员组拍摄。穿过画面的明显暗线就是运河，并在（右上区）与8#州际公路相交。运河流量26155立方英尺，自科罗拉多河西行，供给加利福尼亚帝王谷的农业区和西北部圣迭哥等9座城市用水需求。运河系统是帝王谷唯一的水源，滋润了50万亩以上的农田；四大主要支流之一的科切拉运河引水北往帝王谷。
Image Credit: NASA

完整图，1440X960
http://www.nasa.gov/images/content/330927main_ISS018-E-24949_lrg_full.jpg

                               
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这条运河难道比我们的京杭大运河更大吗？我绝对不信！

这条运河难道比我们的京杭大运河更大吗？我绝对不信！
gohomeman1 发表于 2009-4-24 15:04

                               
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人家说的是“全球最大的灌溉运河”，这在中国最多叫“干渠”。京杭大运河是漕运用的。

京杭大运河应该是最长,而且不算灌溉运河吧

2009-04-25
Mt. Everest
珠穆朗玛峰全景

                               
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On May 29, 1953, Edmund Hillary, from New Zealand, and Tenzing Norgay,from Nepal, became the first humans to successfully climb to the peak of Mt. Everest, the tallest mountain in the world. They were part of a British expedition lead by Colonel John Hunt sent specifically to reach what was regarded at the time as the 'third pole.' In decades prior,major British expeditions had attempted to be the first to reach the North and South Poles only to come in second place behind the Americans(Robert Peary's expedition to the North Pole) and the Norwegians (Roald Amundsen's expedition to the South Pole). The British made seven attempts to scale Mt. Everest in the previous decades, usually on the North Face from Tibet. But following the Chinese Revolution in 1949,this route to the mountain was closed and so Mt. Everest expeditions had to explore new routes to reach the peak.
1953.5.29，来自新西兰的埃德蒙.希拉里和尼泊尔的丹增·诺尔盖成为首次征服全球最高的珠穆朗玛峰的人。 他们是由约翰·亨特上校带领的英国探险队的成员，特选他们2位攻克当时公认的“世界第三极”。在更早的时代，英国主要的探险队试图首先到达北极和南极，不幸的是，他们都只得了第2名：美国人罗伯特‧皮里的探险队1909.04.06首先征服北极，挪威人罗尔德.阿蒙森的探险队1911.12.24首先到达南极。此前10年，英国派遣了7支探险队企图征服从西藏的北坡征服珠峰，全部铩羽而归。随着1949年新中国建立，英国人不敢再从北坡登顶了，他们就选择更容易爬上的南坡。
The 1953 British Expedition climbed up onto the South Col and then along the Southeast Ridge by a route, which is now the most heavily used by the thousands of climbers who have attempted to climb the mountain since. At the time, there were some doubts whether this approach was possible. At29,035 feet (8,848 m) in altitude, the air is only one-third as thick as the air at sea level. Members of the expedition, as they did inprevious attempts, carried bottled oxygen, but this made for a veryheavy load on the climbers and could only supplement their oxygen needs, not fully meet them.
1953年英国探险队是从南坡爬上珠峰的，然后沿着东南山脊回去。这条路线从此成为攀登珠峰的最常用路线，被数千登山队用过；而当时，他们还有些担心此路是否可行——在海拔8848m的顶峰，大气稀薄到只有海平面的1/3密度；探险队员在攀爬之前要带上氧气瓶，但这样就会造成极大的负重，从而氧气仅够他们攀上山顶而不够全程需求。
Since 1953, many successful expeditions have climbed Mt. Everest, including the first American expedition in 1963. However, most climbers fail to make the peak, and many people die each year in the attempt. As of 2003 when this Landsat7 image was taken, more than 5,000 people have attempted to repeat their feat with only 1,600 successes and 175 fatalities.
从1953年以来，许多探险队成功登上珠峰，包括美国首次于1963年登顶成功。不过，还有许多登山者失败了，每年还有不少死难者。在2003年美国地球资源卫星7号拍摄此图前，5000多登山者试图重复前人的足迹，但只有1600多人次成功，还有175例致命事故。

Image Credit: NASA

PS：原文带有严重的政治色彩，后面1949年一段完全是污蔑我们的祖国，我不会照它原文翻译的。众所周知，达赖等叛国就是英国为首的列强挑唆的。而且英国佬根本无能从北坡登顶珠峰，而不是什么不得不找新路线。由于西藏本来已经沦为英国半殖民地，当然更加方便了。——by gohomeman1

1600X1200壁纸，NASA怎么从来不提供宽屏壁纸

                               
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4000X4000完整大图，3.2MB
http://www.nasa.gov/images/content/335340main_landsat_everest_05jan2002_lrg_full.jpg

由于图较大，请大家自己下载，不贴图了。

090426没图发布，今天是0427，NASA的图姗姗来迟。