Scientists say that almost all the gold on the earth comes from outer space. A long time later, a supernova explosion occurred at the end of evolution, some stars died, some nuclear fusion and nuclear reactions took place, and various elements were formed during this period. Gold on the earth is the product left over from the constant collision, death and formation of these stars. The natural gold on the earth basically exists in the form of pure gold.
New knowledge review:
Gold is one of the most malleable metals. 1 g gold can be used to draw 4000-meter-long gold wire, or hammered into gold foil much thinner than paper, and traces can be drawn on the surface of gold with nails. The side length of a ton of gold cube is less than 40 cm, which is about the size of a computer mainframe. Every year, 1 10,000 people in the world make a living by mining gold. At present, more than 90% of gold mines in the world have been mined. Of course, this is only a gold mine that can be mined on the surface, and there are still a lot of gold mines on the seabed. Perhaps in the future, humans will re-evolve gills in pursuit of gold.
According to the study, most of the gold on the earth comes from outer space, and 90% of the gold mines are mined.
Gold is an alien object.
Gold is the "legacy" left by the death star to the earth. The natural gold on the earth basically exists in the form of pure gold. Glittering gold gives human beings an instinctive concern and preference.
Earlier this year, it was reported that Australian prospectors dug up a piece of gold weighing 5.5 kilograms, with an estimated value of $300,000. This makes people wonder how much gold there is on the earth and where it comes from.
"It can be said that almost all the gold on the earth comes from outer space."
Wu Xuefeng, a researcher at the Purple Mountain Observatory, told Discovery Weekly. Wu Xuefeng introduced that the latest research results show that the age of the universe is about 65.438+0.382 billion years, which is much larger than the 4.6 billion years of the earth. "The age of the solar system in the universe is not big. Before the formation of the solar system, there were some stars on its' site'. After a long time, these stars were exploded by supernovae at the end of evolution, some died and some fused, during which various elements were formed. These formed elements combine to form the solar system and superstars, and then evolve into new planets, such as the Earth, Venus and Mars ... "And the gold element on the Earth is the product left over from the constant collision, death and formation of these stars.
As early as the Stone Age more than 6,200 years ago, Bulgarian primitive people began to process gold, and in 3600 BC, the ancient Egyptians mastered the gold purification technology. According to historical records, King scarlatti of Mitanni called gold "more than clay" in Egypt at that time. The reason why gold was discovered so early by human beings is that it exists in nature in the form of pure gold and shines in the sun. Humans, like many animals, have a natural concern and preference for luminous things.
According to the official website of the World Gold Council, 654.38+0 million people in the world depend on gold mining for a living every year, and since the California Gold Rush, more than 90% of the world's gold mines have been mined. Of course, this is only a gold mine that can be mined on the surface, and there are still a lot of gold mines on the seabed.
Gold is a chemical substance.
The chemical properties of gold are very stable, with excellent chemical corrosion resistance and discoloration resistance. "Real gold is not afraid of fire", and gold can resist high temperature. At the same time, gold is very "gentle" and is the darling of industrial manufacturing.
To put it bluntly, gold is a kind of heavy metal, but its popularity must be related to its own characteristics. The chemical properties of gold are very stable, with excellent chemical corrosion resistance and discoloration resistance, and can withstand high temperature, especially in alkali and various acids. "Only in aqua regia, that is, a mixture of hydrochloric acid and nitric acid of 3: 1, and a small amount of solution can it be dissolved. It is this stability that has kept gold handed down from ancient times to the present. " Wei Xiaolan, an associate professor at the School of Chemistry and Chemical Engineering of South China University of Technology, said.
At the same time, the density of gold is particularly high. Make a ton of gold into a cube, which is about as big as a shoe box. This property of gold may be used to explain why "swallowing gold to commit suicide" is really feasible. "Although gold is unlikely to react with gastric juice and produce harmful substances, it is also possible that a small piece is extremely heavy, which will oppress the stomach, cause gastric perforation and bleeding, affect digestion and eventually lead to death."
Although gold is "stubborn"-insoluble and "heavy"-with high density, who would have thought that gold is "gentle" at heart: gold has high ductility and softness. When costume dramas or Olympic champions win gold medals, they can often be seen biting gold and leaving faint teeth marks.
"Gold is one of the most malleable metals. 1 gram of gold can be drawn into a gold wire with a length of 4,000 meters, or it can be hammered into a gold foil much thinner than paper, and traces are drawn on the surface of gold with nails. " Wei Xiaolan said.
The various properties of gold make it the darling of many industrial manufacturing industries. Gold is often made into gold wire and gold powder, plated on the surfaces of other metals, pottery and glass, or made into superconductors and organic gold, which is widely used in high-tech industries, such as electronics, communications, chemical industry, medical treatment and other fields.