本帖最后由 gohomeman1 于 2009-6-19 23:35 编辑
Jack Hills, Australia
澳大利亚，杰克丘陵
The oldest material on Earth which has yet been dated by man is a zircon mineral that is 4.4 billion years old and comes from a sedimentary gneiss in the Jack Hills of Australia's Narre Gneiss Terrane. It is the most ancient fragment of the earth’s crust so far identified, formed approximately 150 million years after the planet itself. In August 2007, scientists reported finding the world’s oldest diamond crystals, encased inside the zircon crystals.
全球最古老的岩石在哪里？它是一种锆石矿，已经有44亿年的历史，就在杰克丘陵中，澳大利亚纳勒片麻岩带通过这片丘陵。它是地壳最古老的碎片之一，形成年代非常的久远——我们的行星诞生不过1.5亿年后它就形成了。2007.8，科学家又报告说在锆石结晶中发现了地球上最古老的金刚石。
The image was acquired by ASTER on Oct. 12, 2004. With its 14 spectral bands from the visible to the thermal infrared wavelength region and its high spatial resolution of about 50 to 300 feet, ASTER images Earth to map and monitor the changing surface of our planet and is one of five Earth-observing instruments launched Dec. 18, 1999, on NASA's Terra satellite.
本图由地球资源卫星的ASTER仪摄于2004.10.12。ASTER拥有从可见光到远红外线的14个光谱带和相当高的空间分辨率：地球照片的分辨率约50~300英尺。它绘制地表地图、监控我们行星表面的变迁。ASTER是美国宇航局于1999.12.18发射的地球资源卫星上载有的5个科学仪器之一。
The broad spectral coverage and high spectral resolution of ASTER provides scientists in numerous disciplines with critical information for surface mapping and monitoring of dynamic conditions and temporal change.
ASTER的宽光谱能力和光谱的高分辨率使科学家可以在许多学科中获得关键性信息，比如地表地图绘制和监测地表的动态的和长时期的变迁等。
Image Credit: NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team
图像版权：美国宇航局、戈达德太空中心，日本经济产业省、遥感数据分析中心、日本资源观测组织，以及美国/日本ASTER联合科学家团队
PS：ASTER是美国地球资源卫星携带的Advanced Spaceborne Thermal Emission and Reflection Radiometer的缩写，就是先进空间热辐射和热反射探测仪的意思。
我们现在知道，C在宇宙的丰度并不低，尤其在白矮星中，有的是金刚石，而且这种钻石的密度极大，如果能加工这类钻石和这类铁，绝对如武侠小说所言：削铁如泥。——gohomeman1 |
显身卡
