A rocky world orbiting a nearby star has been confirmed as the first planet outside our solar system to meet key requirements for sustaining life, scientists said on Monday.
Modelling of planet Gliese 581d shows it has the potential to be warm and wet enough to nurture Earth-like life, they said.
It orbits a red dwarf star called Gliese 581, located around 20 light years from Earth, which makes it one of our closest neighbours.
Gliese 581d orbits on the outer fringes of the star’s "Goldilocks zone", where it is not so hot that water boils away, nor so cold that water is perpetually frozen. Instead, the temperature is just right for water to exist in liquid form.
"With a dense carbon dioxide atmosphere -- a likely scenario on such a large planet -- the climate of Gliese 581d is not only stable against collapse but warm enough to have oceans, clouds and rainfall," France’s National Centre for Scientific Research (CNRS) said in a press release.
More than 500 planets orbiting other stars have been recorded since 1995, detected mostly by a tiny wobble in stellar light.
Exoplanets are named after their star and listed alphabetically, in order of discovery.
Until now, the big interest in Gliese 581’s roster of planets focussed on Gliese 581g.
It leapt into the headlines last year as "Zarmina’s World," after its observers announced it had roughly the same mass as Earth’s and was also close to the Goldilocks zone.
But that discovery has since been discounted by many. Indeed, some experts suspect that the Gliese 581g may not even exist but was simply a hiccup in starlight.
Its big brother, Gliese 581d, has a mass at least seven times that of Earth and is about twice our planet’s size, according to the new study, which appears in a British publication, The Astrophysical Journal Letters.
The planet, spotted in 2007, had initially been dismissed as a candidate in the hunt for life.
It receives less than a third of the solar radiation Earth gets, and may be "tidally locked", meaning that one side of it always faces the sun, which would give it permanent dayside and nightside.
But the new model, devised by CNRS climate scientists Robin Wordsworth, Francois Forget and colleagues, showed surprising potential.
Its atmosphere would store heat well, thanks to its dense CO2, a greenhouse gas. And the red light from the star would also penetrate the atmosphere and warm the surface.
"In all cases, the temperatures allow for the presence of liquid water on the surface," say the researchers.
For budding travellers, though, Gliese 581d would "still be a pretty strange place to visit," the CNRS said.
"The denser air and thick clouds would keep the surface in a perpetual murky red twilight, and its large mass means that surface gravity would be around double that on Earth."
Getting to the planet would still require a sci-fi breakthrough in travel for earthlings.
A spaceship travelling close to light speed would take more than 20 years to get there, while our present rocket technology would take 300,000 years.
No Bank Deposits Will Be Spared from Confiscation 2013 05 18
As alert Zero Hedge readers are aware, this week the EURO Politburo is busy debating the dodgy subject of deposit "bail-ins."
The following article very succinctly explains this odious mode of fractal fractional reserve end-game chicanery.
The author encourages all of you to share it with others.
NO BANK DEPOSITS WILL BE SPARED FROM CONFISCATION
By Matthias Chang Esq, futurefastforward.com (with author’s permission)
I challenge ...
Military Says No Presidential Authorization Needed To Quell “Civil Disturbances” 2013 05 17 A recent Department of Defense instruction alters the US code applying to the military’s involvement in domestic law enforcement by allowing US troops to quell “civil disturbances” domestically without any Presidential authorization, greasing the skids for a de facto military coup in America along with the wholesale abolition of Posse Comitatus.
The instruction (embedded at the end of this article), which ...
Ancient Maya Pyramid Destroyed in Belize 2013 05 17 An archaeological group says it plans to take legal action.
Despite its small size, the Caribbean country of Belize is known for a few outstanding characteristics: a spectacular barrier reef, a teeming rain forest, and extensive Maya ruins.
It now has one fewer of those ruins.
A construction company in Belize has been scooping stone out of the major pyramid at the site ...
Ginger: A Warming Herb 2013 05 17
Ginger is an Asian herb that is particularly well known to us in the West. Over time, and with trial and error, its stimulating properties and piquant flavor have been integrated into both our herbal “materia medica” and cuisine.
Brewed as an herbal tea, ginger root is particularly helpful for those people who have underactive stomachs and difficulty producing adequate amounts ...
Australian man dead for 40 minutes revived with new CPR machine 2013 05 17 In an Australian first, doctors have used a new resuscitation technique to revive three patients who were clinically dead for up to an hour.
One of the lucky survivors was Colin Fiedler, 49, who was pronounced dead at The Alfred Hospital in Melbourne, Victoria, after suffering a heart attack, The Herald Sun reported.
Doctors brought Fieldler back to life using a U.S.-made ...
No Bank Deposits Will Be Spared from Confiscation
Military Says No Presidential Authorization Needed To Quell “Civil Disturbances”
Ancient Maya Pyramid Destroyed in Belize
Ginger: A Warming Herb
Australian man dead for 40 minutes revived with new CPR machine