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New revolutionary
NASA's discovery


Earth has twins planets. Now we know. Nasa's scientists discovered a new system of seven planets very similar to the Earth for chemical features like dimension and temperature. It's an extraordinary findings published on Nature: "This is the first time so many planets of this kind are found around the same star" , Michael Gillon, an astronomer at the University of Liege in Belgium and leader of an international team of this discovery, said during the conference to announce the scientific news. Probably the planets, who haven't a name yet, are made by rock and on their surfaces the temperature starts from zero and reaches to one hundred degrees. They orbit a dwarf star named Trappist-1, that is 39 light-years far from the Earth. Its name derives from a robotic telescope in the Atacama Desert of Chile that astronomers used to study the star already discovered one year ago.

Trappist-1 is defined an "ultracool dwarf" because of its temperature of 4.150 degrees Fahrenheit, much cooler than Sun's one and it's only the 8% of its mass. Scientist are divided on the color of the star: they expeted a deep red, instead its light is out of view of human eyes and so it appears salmony. The star of this new system works like a magnet: seven planets are "gravitationally locked" to it and face the star with only one side. "They form a very compact system" - explain Dr. Gillon, the coordinator of the research -"the planets being pulled close to each other and very close to the star" that he defined a golf ball compared to the basketball of Sun's size. The exoplanets cicle more quickly than the planets of solar system. The innermost one needs only one day and half to orbit dwarf star and the farthest about 20 days.

The scientific discovery is a new step very near to answer a question: "Are we alone out here?". It's the secular human question. "You can just image how many worlds are out there that have a shot to becoming a habitable ecosystem", Thomas Zurbuchen, associate administrator of NASA's science mission directorate, try to illustrate why the research is so importance for future's life.

Tomorrow Earth could not be the only planet habitated. Scientists always try to find piece of evidence of different life form and, in this case, they could be very close to solve the mystery. Now it is not just a speculation: the planet surfaces could be at the right temperature to host oceans and water is synonyms of life. More over, the two innermost planets are not enveloped in hydrogen and so it demonstrates they are made by rock, just like Earth. If planet's atmosphere contains oxygen, it will be the evidence of photosynthesis process and, more over, "will tell us there is life with 99 percent of condidence", how Dr. Gillon explains. Scientist could be wrong on where to search habitable places or how. Astronomers expect new advanced technologies to go deeper into this research and to succeed observations of this planets that until now could not be photographed. Scientist have not named yet these planets, but all makes us think they will go down in history as "new planets of life", stealing the title from Mars.

Paola Corona

[20.3.2017 - 10:51]



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