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    Scientists find most Earth-like planet yet

    CNN link

    WASHINGTON (AP) -- European astronomers have found the most Earth-like planet outside our solar system, and here's what it might be like to live there:

    The "sun" wouldn't burn brightly. It would hang close, large and red in the sky, glowing faintly like a charcoal ember. And it probably would never set if you lived on the sunny side of the planet.
    You could have a birthday party every 13 days because that's how fast this new planet circles its sun-like star. But watch the cake -- you'd weigh a whole lot more than you do on Earth. (Learn more about exoplanets)

    You might be able to keep your current wardrobe. The temperature in this alien setting will likely be a lot like Earth's -- not too hot, not too cold.

    And that "just right" temperature is one key reason astronomers think this planet could conceivably house life outside our solar system. It's also as close to Earth-sized as telescopes have ever spotted. Both elements make it the first potentially habitable planet besides Earth or Mars.

    Astronomers who announced the discovery of the new planet Tuesday say this puts them closer to answering the cosmic question: Are we alone?

    "It's a significant step on the way to finding possible life in the universe," said University of Geneva astronomer Michel Mayor, one of 11 European scientists on the team that found the new body. "It's a nice discovery. We still have a lot of questions."

    There's still a lot that is unknown about the new planet, which could be deemed inhospitable to life once more is learned about it. But as galaxies go, it's practically a neighbor. At only 120 trillion miles away, the red dwarf star that this planet circles is one of the 100 closest to Earth.
    The results of the discovery have not been published but have been submitted to the journal Astronomy and Astrophysics.

    Alan Boss, who works at the Carnegie Institution of Washington where a U.S. team of astronomers competed in the hunt for an Earth-like planet, called it "a major milestone in this business."

    The planet was discovered by the European Southern Observatory's telescope in La Silla, Chile, which has a special instrument that splits light to find wobbles in different wavelengths. Those wobbles can reveal the existence of other worlds.

    What they revealed is a planet circling the red dwarf star, Gliese 581. Red dwarfs are low-energy, tiny stars that give off dim red light and last longer than stars like our sun. Until a few years ago, astronomers didn't consider these stars as possible hosts of planets that might sustain life.
    The discovery of the new planet, named 581 c, is sure to fuel studies of planets circling similar dim stars. About 80 percent of the stars near Earth are red dwarfs.

    The new planet is about five times heavier than Earth, and gravity there would be 1.6 times as strong as Earth's. Its discoverers aren't certain if it is rocky like Earth or if its a frozen ice ball with liquid water on the surface. If it is rocky like Earth, which is what the prevailing theory proposes, it has a diameter about 1 times bigger than our planet. If it is an iceball, as Mayor suggests, it would be even bigger.

    Based on theory, 581 c should have an atmosphere, but what's in that atmosphere is still a mystery and if it's too thick that could make the planet's surface temperature too hot, Mayor said.

    However, the research team believes the average temperature to be somewhere between 32 and 104 degrees and that set off celebrations among astronomers.

    Until now, all 220 planets astronomers have found outside our solar system have had the "Goldilocks problem." They've been too hot, too cold or just plain too big and gaseous, like uninhabitable Jupiter.

    The new planet seems just right -- or at least that's what scientists think.

    "This could be very important," said NASA astrobiology expert Chris McKay, who was not part of the discovery team. "It doesn't mean there is life, but it means it's an Earth-like planet in terms of potential habitability."

    Eventually astronomers will rack up discoveries of dozens, maybe even hundreds of planets considered habitable, the astronomers said. But this one -- simply called "c" by its discoverers when they talk among themselves -- will go down in cosmic history as No. 1.

    Besides having the right temperature, the new planet is probably full of liquid water, hypothesizes Stephane Udry, the discovery team's lead author and another Geneva astronomer. But that is based on theory about how planets form, not on any evidence, he said.

    "Liquid water is critical to life as we know it," co-author Xavier Delfosse of Grenoble University in France, said in a statement. "Because of its temperature and relative proximity, this planet will most probably be a very important target of the future space missions dedicated to the search for extraterrestrial life. On the treasure map of the Universe, one would be tempted to mark this planet with an X."

    Other astronomers cautioned it's too early to tell whether there is water.

    "You need more work to say it's got water or it doesn't have water," said retired NASA astronomer Steve Maran, press officer for the American Astronomical Society. "You wouldn't send a crew there assuming that when you get there, they'll have enough water to get back."
    The new planet's star system is a mere 20.5 light years away, making Gliese 581 one of the 100 closest stars to Earth. It's so dim, you can't see it without a telescope, but it's somewhere in the constellation Libra, which is low in the southeastern sky during the mid-evening in the Northern Hemisphere.

    Even so, Maran noted, "We don't know how to get to those places in a human lifetime."

    But, oh, the view, if you could. The planet is 14 times closer to the star it orbits. Udry figures the red dwarf star would hang in the sky at a size 20 times larger than our moon. And it's likely, but still not known, that the planet doesn't rotate, so one side would always be sunlit and the other dark.

    Two teams of astronomers, one in Europe and one in the United States, have been racing to be the first to find a planet like 581 c outside the solar system.

    The European team looked at 100 different stars using a tool called HARPS (High Accuracy Radial Velocity for Planetary Searcher) to find this one planet, said Xavier Bonfils of the Lisbon Observatory, one of the co-discoverers.

    Much of the effort to find Earth-like planets has focused on stars like our sun with the challenge being to find a planet the right distance from the star it orbits. About 90 percent of the time, the European telescope focused its search more on sun-like stars, Udry said.

    A few weeks before the European discovery earlier this month, a scientific paper in the journal Astrobiology theorized a few days that red dwarf stars were good candidates.

    "Now we have the possibility to find many more," Bonfils said.


    Last edited by ISUFan22; 05-02-2007 at 10:30 AM.

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    Re: Scientists find most Earth-like planet yet

    I've never understood why people are under the belief that the only possible planets that can hold life are those like Earth. For crying out loud, if they're extra-terrestrials, I figure they don't need to be carbon-based life forms. Just because we can't comprehend a life form that isn't like the ones we've seen here on Earth doesn't mean that the life forms found here are the only possible types of life forms throughout the universe... which we only have even seen about 1-2% of, if that.


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    Re: Scientists find most Earth-like planet yet

    Quote Originally Posted by ISUFan22 View Post
    Even so, Maran noted, "We don't know how to get to those places in a human lifetime."
    The biggest thing from the article for me was that line. We're finding these places and that's excellent. Yet we still don't have a way of getting there.

    Maybe Google Maps can help...



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    Re: Scientists find most Earth-like planet yet

    Maybe our engineering department can invent a Millennium Falcon.



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    Re: Scientists find most Earth-like planet yet

    If their gravity is stronger than hours, does that mean if they came here they could fly like superman. Ha ha just kidding. I would like to know if there is life on other planets but will never be around when they actually get to find out it. I wonder if it will ever happen anyway. Im sure this world will blow itself up long before that.



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    Re: Scientists find most Earth-like planet yet

    That's actually a couple of weeks old news, my friends.

    What is new is NASA's now got a model of what this planet looks like...

    Attachment 353


    Last edited by jdoggivjc; 08-21-2007 at 09:20 AM.
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    Re: Scientists find most Earth-like planet yet

    I'm a little confused by the speculation about this considering that all they know is how close to a star it is and how much it "wobbles". Seems like the article is assuming or infering a lot more that they actually know.



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    Re: Scientists find most Earth-like planet yet

    Quote Originally Posted by bostinelosd View Post
    If their gravity is stronger than hours, does that mean if they came here they could fly like superman.
    Nope...but we should send our athletes there for training. Lots of jumps. lol



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    Re: Scientists find most Earth-like planet yet

    SWEEEEEEET! Now We have a place to shove all the hawk fans to.


    Remember that stressed spelled backwards is desserts!

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    Re: Scientists find most Earth-like planet yet

    count up how many could, maybe, possiblys, etc in that article...and then that's considered science.



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    Re: Scientists find most Earth-like planet yet

    See Above for the first Hawk fan to send there!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!



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    Re: Scientists find most Earth-like planet yet

    Quote Originally Posted by isufbcurt View Post
    See Above for the first Hawk fan to send there!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    Wow...that's a lot of exclaimation points.

    Quote Originally Posted by JonDMiller View Post
    count up how many could, maybe, possiblys, etc in that article...and then that's considered science.
    Still not a better gig than a weatherman. What other job do people actually EXPECT you to fail at but yet have really good job security?



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    Re: Scientists find most Earth-like planet yet

    I think there's a future for plastic surgery on that planet.



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    Re: Scientists find most Earth-like planet yet

    Quote Originally Posted by mjones34 View Post
    SWEEEEEEET! Now We have a place to shove all the hawk fans to.

    For crying out loud, do you really want the responsibility for ruining another planet with these guys?



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    Re: Scientists find most Earth-like planet yet

    Quote Originally Posted by bostinelosd View Post
    For crying out loud, do you really want the responsibility for ruining another planet with these guys?


    Dang it! you're right, but at least trillions of miles away is better than 136......although we'd still hear them biquering, complaining and making excuses.


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