A group of scientists published a study that reveals the existence of basic molecules of DNA and RNA in meteorites found in Antarctica. There are multiple theories that attempt to explain how did life appear on Earth.
The Legion Paleontologists and scientists working to recreate the puzzle of the species ancestor by ancestor, piece by piece trying to draw a tree species dating back millions of years. Some of these scientists hold the tip of the spear which opens the remote information at the time. Are those who try to dispel doubts about the origin of Life.
The germ of life came from outer space:
One theory is probably the most revolutionary offer a plausible solution to the question, how life appeared on Earth? It is becoming harder to take, given the amount of data, evidence and proof tested. For over 30 years, this theory was supported by well-known popularizer, Carl Sagan, in his work Cosmos said: “We are all part of the same, ultimately, we are made of stardust”.
Life came to Earth in the form of proteins traveling through space on meteorites. This statement is what they propose a group of scientists among them Jim Cleaves has the Carnegie Geophysical Laboratory and Michael Callahan NASA Goddard.
Meteorites, vehicles of the molecules of life:
The news has come to the media, published this past Monday a team in the journal Proceedings of National Academy of Sciences one of the most prestigious in the world on issues related to Science, which directly points to the evidence found in meteorites carrying organic material and possibly fall to Earth spreading life.
Computer scientists have used advanced tools of mass spectrometry to analyze 11 rich meteorites called carbonaceous chondrite organic matter with nucleic bases, which help to make macromolecules which form the DNA and RNA in living things.
Chondrites are rocky parts, unlike the metallic asteroids have not undergone mergers. This origin has preserved organic material without destroying it. Among them there are called chondrules, small spheres that carry little water or minerals that have been altered by water.
The findings:
As indicated by Cleaves about the content of that text, have found three nucleic bases, purine, 6.8 and 2.6-diaminopurine, also called analogues, which “Are widely distributed in the carbonaceous chondrites, which are rare or absent in terrestrial biology,” it offers an explanation for his extraterrestrial origin. Also, meteorites carrying other two compounds, adenine and guanine present in the DNA of any living being.
The team, once certain tests, performed several experiments to support their conclusions. Specifically, to reproduce the nucleic bases were used chemical reactions with ammonia and cyanide compounds, common in space.
The reactions leading to nucleic bases of synthesis that were strikingly similar to those found in chondrites, although significantly higher amounts. The difference in the concentration of nucleic bases could be explained by thermal and chemical processes that chondrites have had to suffer throughout their journey through space.
Terrestrial contamination is ruled out:
One of the reasons that could throw the entire study fret is the possible contamination of samples in contact with the atmosphere. To this end, the team has taken action and have studied the environment in which the meteorites were found.
In particular, when we analyzed the surrounding used to analyze nearly ten kilograms of ice in the Antarctic environment. The ice has investigated the presence of the nucleobases, with significant presence negligible.
