Wednesday, October 9, 2013

Sugita and Schultz simulated asteroid impact on Earth


The current study astrobiologické talks about the early Earth as a relatively barren planet with a very high incidence of organic compounds. It's on them but today our lives built from the ground up. For a long time, scientists believe that organic compounds were transported to Earth from space.
Some go in their thinking even further and believe that even water was largely conveyed from space and perhaps even life itself arose on Earth, but far away in space. The theory of panspermia has its enthusiastic supporters and opponents for decades.
Panspermia in the article we will devote this time, but we will in the footsteps of origin of organic compounds, several billion years ago in the geological joann history of the earth. Astronomers and astrobiologists have long believe that organic compounds on our planet get the impacts of asteroids and comets. The reasoning is logical, because the small bodies of the solar system are rich in organic compounds and at a time when the Earth was young, I turned out with more than high frequencies.
Anyone who has seen at least one of a Hollywood blockbuster about cosmic Armageddon, however, think that the asteroid or comet after impact at a speed of several kilometers joann per second, much is left. In the great heat has a chance to even the toughest organic molecule. Upon impact might arise as simple molecules (eg, carbon dioxide).
Astrobiologists are still working with the theory that organic molecules were formed in the atmosphere from chemical reactions caused by lightning. joann This theory, however, would be valid only in the early atmosphere of the planet, which was rich in hydrogen and methane. In later times, similar joann reactions seem rather unlikely.
Sugita and Schultz simulated asteroid impact on Earth's surface. No small body in the solar system, joann the experiment did not want to participate voluntarily and scientists are not able to find a suitable location for impact, and so had to make do with a substitute. Rollicking asteroid collision course with the experiment was represented bullet joann made of polycarbonate. Ambient atmosphere was replaced by a mixture of argon, nitrogen and oxygen. The bullet was fired onto a copper plate at a sharp angle at about 6 km / s From the experimental results it appears that the reaction of carbon from bullets and nitrogen from the atmosphere created cyanide.
Cyanide does not possess the earth just a good reputation, but the origin joann of life could play an important role. In subsequent reactions of cyanide with "earth compounds" could develop more complex molecules, which later became the cornerstone of life on our planet.
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