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Science Over the EdgeA Roundup of Strange Science for the MonthApplet credit: Ed Hobbs
June 2006 |
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In the News:
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What's New at the Museum:
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Ask the Curator:
After the big bang the universe consisted of lot of hydrogen and helium. No gold. No lead. In fact, no metals of any kind. It was only when the first generation of stars were born that metals began to form deep within their fusion furnaces. Under the intense pressure and heat caused by the gravity of a star the light hydrogen atoms are fused together to form heavier helium. If the star is of medium size (such as our sun) or larger, the fusion can also create heavier elements including heavy metals like gold and lead. The lighter atoms in a fusion reaction have slightly more mass then the resulting heavier atoms and the mass that is lost is turned into energy according to Einstein's famous formula E=mc2. This energy is what makes a star give off heat and light and is the same process at the heart of a Hydrogen Bomb. This means that almost everything you see around you - your watch, the computer you're are reading this on, the gold ring you're are wearing, and even yourself - were formed in some distant past in the depth of a star. As the late Dr. Carl Sagan was found of saying, we are all "star stuff." Eventually this material was scattered about the galaxy and became part of new stars and solar systems. Rocky planets like our own Earth are formed mostly of these heavier materials. Gold is one of the more uncommon metals that was generated in the stars. Although it is scattered widely throughout the planet and can be found almost anywhere, it is almost never concentrated enough to make it worth recovering. For example, it is estimated that a cubic kilometer of sea water contains 6 kilograms of pure gold, but nobody has figured out an economic way of getting at it. Sometimes by natural processes gold is concentrated into "seams" or "veins" and this is what miners are looking for. Because gold is highly soluble compared to other minerals it is almost always the last to crystallize out as water disappears and the first to dissolve when water returns. This has a concentrating effect. The vein a miner finds is usually the remains of an underground flow of water that carried a highly concentrated solution of gold. As the water disappeared the material crystallized into nearly pure gold. As to the appearance of gold on turbine blades: I have been unable to find any reference to this, however, since gold is so highly soluble in water, it could be that turbine blades operating a river, or ocean or with steam, could somehow cause the some of the gold in solution to be deposited on the blades. A similar issue happens with copper deposits and certain types of power plants if there is copper present in the water being used. What the mechanism for this effect is I don't know, but perhaps one of our knowledgeable readers can help us out.
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In the Sky:
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Observed:
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LGM: Science over the Edge ArchivesLGM Archive 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Copyright Lee Krystek 2006. All Rights Reserved. |