{"id":1218,"date":"2011-05-18T12:16:45","date_gmt":"2011-05-18T12:16:45","guid":{"rendered":"http:\/\/www.zistgah.com\/fa\/2011\/05\/18\/uou%c2%81-o%c2%b3uoeo%c2%a7o%c2%b1u%e2%80%a1-o%c2%a7uoe-uo%c2%a7o%c2%a8u-o%c2%b2u%e2%80%a0o%c2%afu%c2%afuoe-ooe-uou-o%c2%b2uuoeu%e2%80%a0\/"},"modified":"2011-05-18T12:16:45","modified_gmt":"2011-05-18T12:16:45","slug":"uou%c2%81-o%c2%b3uoeo%c2%a7o%c2%b1u%e2%80%a1-o%c2%a7uoe-uo%c2%a7o%c2%a8u-o%c2%b2u%e2%80%a0o%c2%afu%c2%afuoe-ooe-uou-o%c2%b2uuoeu%e2%80%a0","status":"publish","type":"post","link":"http:\/\/www.zistgah.com\/old\/1390\/02\/28\/uou%c2%81-o%c2%b3uoeo%c2%a7o%c2%b1u%e2%80%a1-o%c2%a7uoe-uo%c2%a7o%c2%a8u-o%c2%b2u%e2%80%a0o%c2%afu%c2%afuoe-ooe-uou-o%c2%b2uuoeu%e2%80%a0\/","title":{"rendered":"\u06a9\u0634\u0641 \u0633\u06cc\u0627\u0631\u0647 \u0627\u06cc \u0642\u0627\u0628\u0644 \u0632\u0646\u062f\u06af\u06cc \u060c \u0645\u062b\u0644 \u0632\u0645\u06cc\u0646"},"content":{"rendered":"
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\"\u06a9\u0634\u0641<\/p>\n

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A planet 20 lightyears away is the first outside our solar system to be declared ‘habitable’ byscientists<\/span><\/span><\/span>.<\/span><\/o:p><\/span><\/p>\n

 <\/o:p><\/span><\/p>\n

The rocky‘exoplanet’ Gliese 581d meets key requirements for sustaining Earth-like life,including rainfall and possibly even watery oceans<\/span><\/span><\/span>.<\/span><\/o:p><\/span><\/p>\n

The planet orbits ared-dwarf star similarly called Gliese 581, on its outer fringes called the‘Goldilocks zone’, where the temperature <\/span>is not so hot that water boils away, nor so cold that water isperpetually frozen<\/span><\/span><\/span>.<\/span><\/p>\n

But even though itmay be technically habitable, the Gliese 581d would not make a comfortabledwelling for humans<\/span><\/span><\/span>.<\/span><\/p>\n

Gravity is twicewhat is on Earth, doubling the weight of anyone standing on the surface, andthe atmosphere is dense with carbon dioxide<\/span><\/span><\/span>.<\/span><\/p>\n

With a mass of atleast 5.6 times that of Earth, Gliese 581d is classified as a ‘super-Earth<\/span><\/span><\/span>’.<\/span><\/p>\n

The discovery caughtscientists by surprise because the planet was previously ruled out as ahabitable country<\/span><\/span><\/span>.<\/span><\/p>\n

But a new computermodel with the capacity to simulate extraterrestrial climates has confirmedthat Gliese 581d really could harbour life, showing the prior assumption to bewrong<\/span><\/span><\/span>.<\/span><\/p>\n

"<\/span>This discovery isimportant because it’s the first time climate modellers have proved that theplanet is potentially habitable, and all observers agree that the exoplanetexists,” said Dr Robin Wordsworth, a member of the French team from theInstitut Pierre Simon Laplace in Paris<\/span><\/span><\/span>.<\/span><\/p>\n

"<\/span>If you look at thehistory of the search for habitable planets, there’s been at least twoinstances so far when scientists have announced that a habitable world has beendiscovered, only to have the claim contradicted later, either by climateexperts or by other observers<\/span><\/span><\/span>.”<\/span><\/p>\n

On average, thelight that Gliese 581d receives from its star has about 30 per cent of theintensity of sunlight on Earth<\/span><\/span><\/span>.<\/span><\/p>\n

While thattemperature seems too cold to support liquid water, the atmosphere’s highproduction of greenhouse gases significantly heats the planet<\/span><\/span><\/span>.<\/span><\/p>\n

It may also be"tidally locked", meaning that one side of it always faces the sun,which would give it permanent dayside and nightside<\/span><\/span><\/span>.<\/span><\/p>\n

More than 500planets orbiting other stars have been recorded since 1995, detected mostly bya tiny wobble in stellar light<\/span><\/span><\/span>.<\/span><\/p>\n

Exoplanets are namedafter their star and listed alphabetically, in order of discovery<\/span><\/span><\/span>.<\/span><\/p>\n

Until now, the biginterest in Gliese 581’s roster of planets focused on Gliese 581g<\/span><\/span><\/span>.<\/span><\/p>\n

It swept theheadlines last year as ‘Zarmina’s World’, after its observers announced it hadroughly the same mass as Earth’s and was also close to the ‘Goldilocks zone<\/span><\/span><\/span>’.<\/span><\/p>\n

But that discoveryhas since been discounted by many, with some experts suspecting the Gliese 581gmay not even exist<\/span><\/span><\/span>.<\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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