Kepler 22-b: Earth-like planet confirmed
2011-12-07 0:00

From: bbc.co.uk



Astronomers have confirmed the existence of an Earth-like planet in the "habitable zone" around a star not unlike our own.

The planet, Kepler 22-b, lies about 600 light-years away and is about 2.4 times the size of Earth, and has a temperature of about 22C.

It is the closest confirmed planet yet to one like ours - an "Earth 2.0".

However, the team does not yet know if Kepler 22-b is made mostly of rock, gas or liquid.

During the conference at which the result was announced, the Kepler team also said that it had spotted some 1,094 new candidate planets - nearly doubling the telescope’s haul of potential far-flung worlds.

Kepler 22-b was one of 54 exoplanet candidates in habitable zones reported by the Kepler team in February, and is just the first to be formally confirmed using other telescopes.

Will the elite go?

More of these "Earth 2.0" candidates are likely to be confirmed in the near future, though a redefinition of the habitable zone’s boundaries has brought that number down to 48. Ten of those are Earth-sized.

’Superb opportunity’
The Kepler space telescope was designed to look at a fixed swathe of the night sky, staring intently at about 150,000 stars. The telescope is sensitive enough to see when a planet passes in front of its host star, dimming the star’s light by a minuscule amount.

Kepler identifies these slight changes in starlight as candidate planets, which are then confirmed by further observations by Kepler and other telescopes in orbit and on Earth.


* Stares fixedly at a patch corresponding to 1/400th of the sky
* Looks at more than 155,000 stars
* Has so far found 2,326 candidate planets
* Among them are 207 Earth-sized planets, 10 of which are in the "habitable zone" where liquid water can exist
Kepler 22-b lies 15% closer to its sun than the Earth is to our Sun, and its year takes about 290 days. However, the planet’s host star puts out about 25% less light, keeping the planet at its balmy temperature that would support the existence of liquid water.

The Kepler team had to wait for three passes of the planet before upping its status from "candidate" to "confirmed".

"Fortune smiled upon us with the detection of this planet," said William Borucki, Kepler principal investigator at Nasa’s Ames Research Center.

"The first transit was captured just three days after we declared the spacecraft operationally ready. We witnessed the defining third transit over the 2010 holiday season."

The results were announced at the Kepler telescope’s first science conference, alongside the staggering number of new candidate planets. The total number of candidates spotted by the telescope is now 2,326 - of which 207 are approximately Earth-sized.

In total, the results suggest that planets ranging from Earth-sized to about four times Earth’s size - so-called "super-Earths" - may be more common than previously thought.

As candidates for planets similar to Earth are confirmed, the Search for Extraterrestrial Intelligence (Seti) has a narrower focus for its ongoing hunt.

"This is a superb opportunity for Seti observations," said Jill Tarter, the director of the Center for Seti Research at the Seti Institute.

"For the first time, we can point our telescopes at stars, and know that those stars actually host planetary systems - including at least one that begins to approximate an Earth analogue in the habitable zone around its host star.


Source: bbc.co.uk



Related Articles
Earth-like planet ’may not exist’: Goldilocks just a fairytale?
Could ’Goldilocks’ planet be just right for life?


Latest News from our Front Page

Police Attacked by Mob in Cincinnati, Rescue White Man from Black Beatdown
2015-07-07 0:28
Cincinnati police form a line against mob violence July 4, 2015. Photo: Cincy vs Everyone Fireworks, rocks, bottles and punches were thrown at Cincinnati police by a mob of people gathered for a Fourth of July hip hop and electronica concert late Saturday night. Several officers were wounded including one who needed stitches after a thrown glass bottle struck him in ...
California Rabbi Calls on Amazon to Cease Selling Books on Holocaust Denial
2015-07-07 0:47
A Sacramento rabbi has called on Amazon to ban the sale of books promoting Holocaust denial, CBS Sacramento reported on Friday. “Blatant anti-Semitism,” said Sacramento Rabbi Mendy Cohen, according to the report. “To deny the Holocaust is another mask of blatant anti-Semitism.” Among the books for sale to Amazon customers are titles such as Did Six Million Die? The Truth at Last and The Myth ...
Inna Shevchenko: Naked Breasts Are Political Weapons
2015-07-06 23:46
Inna Shevchenko, the leader of the Femen movement, is not an obscure individual in Europe and much of the Western world. She once bragged: “I’m proud to say we brought the idea of feminism and women’s rights to a politically ignorant part of the world like Ukraine, Russia, Belarus. And I’m proud to say I think we brought feminism back on to ...
Cleric said to be behind Tunisian beach massacre is living on benefits in Britain
2015-07-06 23:11
Cleric said to be behind Tunisian beach massacre is living on benefits in Britain A leader of the terrorist group suspected of being behind the Tunisian beach massacre is living on benefits in Britain. Hani al-Sibai, an al-Qaeda cleric suspected of radicalising "Jihadi John", lives in a £1 million house leafy street in fashionable west London. He is said to be one of ...
Bakers Facing $135K Fine Over Wedding Cake for Same-Sex Couple Speak Out
2015-07-06 23:57
(function(d, s, id) { var js, fjs = d.getElementsByTagName(s)[0]; if (d.getElementById(id)) return; js = d.createElement(s); js.id = id; js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&version=v2.3"; fjs.parentNode.insertBefore(js, fjs);}(document, 'script', 'facebook-jssdk'));A Daily Signal Exclusive: Bakers Facing $135K Fine Over Wedding Cake for Same-Sex Couple Speak OutPosted by The Daily Signal on Monday, April 27, 2015 From the video source: Bakers Facing $135K ...
More News »