There was once a habitable planet…

Could be that good, but we’ve already played.  The planet or planets, which clearly orbited around the star GD 61, had probably all the characteristics we look for in a planet that is suitable to host life: Rocky surface and abundant presence of water. The area of the solar system (or any planetary system) where the temperature is in the range of 273K and 373K is termed the habitable sector. Planets are in balance with their environments: they are neither becoming warmer nor icier.



All planets captivate incident radiation from the planet which warms the planets up, meaning the Sun and to maintain their stability, they must discharge the same quantity of energy. The temperature of a star or planet, it is possible to be estimated by supposing that it’s a dark body. But of that planet around the star 150 light-years away, only fragments remained in the form of asteroids.  To locate them, using the Hubble Space Telescope, there were Jay Farihi of the University of Cambridge and his colleagues, who describe their discovery in the latest issue of Science.  The researchers studied a disc of material around GD 61, now a white dwarf, but in its heyday it was supposed to be a star of mass equal to three times our Sun.  The fragments that make up the disc, scanned with spectrographic tools, are in abundance from magnesium, silicon and iron, which along with oxygen are major components of rocky planets. By measuring the relative concentration of these elements in relation to oxygen, researchers have concluded that the presence of the latter is more than justified by the rock only.  The rest of the oxygen must come from important quantity of water which made the planet (or planets) at the star’s death “to crumble”, creating a debris disk.  Most likely it was a planet of at least 90 km in diameter (but probably much bigger) that once orbited around the star, before it began to die and become a white dwarf star.  A rocky planet that had to be written for the 26 percent of water, more or less the percentage which is located on Ceres, one of the largest asteroids in the solar system, and much greater than that found on Earth.  It is the first time ever that two key elements for a habitable planet are found along with outside our solar system.  “All this supports the idea that the star had a full array of terrestrial planets, gaseous giant planets probably.  A complex system similar to our own, “explains Fahriri.



The giant planets, however, are probably still there, even if we do not see them: just their presence can explain, from a gravitational standpoint, as the rocky bodies are pushed to lower the star up to fall over and become debris.  From another point of view, this study is a look to the future of our solar system.  Even the Sun will end his life in a manner similar to GD 61.  Between six billion years, plus or minus, other planets where the astronomers may observe a debris disk around a dead star, can deduce that at one time there was a habitable planet.

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