Swollen Stars Presages Earth's Demise

[toomyg]

If your into Astronomy and Space stuff like me check this out





http://story.news.yahoo.com/news?tmp...sdemiseGlimpse

[toomyg]

OK lets try this URL

http://story.news.yahoo.com/news?tmp...0916/sc_space/
glimpseatswollenstarspresagesearthsdemise

[toomyg]

Ok url is to long

just going to have to read this





Science - Space.com


Glimpse at Swollen Stars Presages Earth's Demise

Thu Sep 16, 2:35 PM ET Add Science - Space.com to My Yahoo!


Robert Roy Britt
Senior Science Writer
SPACE.com




Today's global warming is nothing compared to what astronomers have just seen through the time machine of a telescope.


The most detailed look ever at the environments very near the surfaces of several aging and bloated red giant stars reveals a potentially red-hot future for Earth. Because the stars are older versions of the one that gives us warmth, the measurements help astronomers envision what will happen in a few billion years, when the swollen Sun will scorch Earth.


The dying objects are called Mira stars, for one of the most famous in a bunch that includes the popular skywatching targets Betelgeuse (often pronounced "beetle juice") and Antares.


Red giants have nearly exhausted the hydrogen that powers their thermonuclear furnaces. Each is swelled to a diameter that is larger than the orbit of our home planet. The aging stars pulsate, expanding and contracting every year or so.


When our Sun begins to pulsate, the surface temperature on Earth will periodically climb to 5,400 degrees Fahrenheit (3,000°C), said Guy Perrin, a Paris Observatory researcher who led the new study.


"The direct consequence is that no life will be possible by then on Earth," Perrin told SPACE.com . "But this is in a few billion years from now."


It is also one reason why Perrin and his colleagues eagerly study Mira stars, whose intense activity has prevented views of their surfaces.


The new work combined several telescopes to effectively create one large observatory in a technique called interferometry, allowing a look at each stars photosphere, the area just above the surface.


"During these pulsations, Mira stars lose a lot of mass to the interstellar medium," Perrin explained. Material equal to about a third of the Earth is pumped into interstellar space with each pulsation. Scientists don't know exactly how all this works.


"The current belief is that pulsations levitate material above the surface, and this material forms dust, which is pushed away by the radiation from the star like a wind," he said.


Behind the wind is a star surrounded by a shell of water vapor and possibly carbon monoxide, the new research found. The presence of this layer, far above the stellar surface, is "somewhat mysterious," Perrin's team reports. It is too high and dense to be supported purely by atmospheric pressure, they say. The pulsations of the star probably have something to do with it.


The researchers were also able to pin down some dimensions. Mira stars are about 30 percent smaller than previous observations had suggested. The surface diameter of each corresponds to a diameter just inside the orbit of Mars. The outer layer of water vapor and carbon monoxide, however, is as far from the stars' centers as the asteroid belt -- between Mars and Jupiter -- is from our Sun.


"This discovery resolves nagging inconsistencies between observations of the size of Mira stars, and models describing their composition and pulsations, which now can be seen to generally agree with each other," said team member Stephen Ridgway of the National Optical Astronomy Observatory in Tucson, Arizona.


And here's what it means in the long run: When our Sun swells, Earth will be engulfed and vaporized and Mars will be seared. One of the remaining questions, on which other scientists have speculated, is whether life on Earth will end due to extreme drought or wait to be utterly fried.


The near-infrared observations were made with the Infrared-Optical Telescope Array (IOTA) of the Smithsonian Astrophysical Observatory in Arizona. The results will be published in the journal Astronomy & Astrophysics.


http://www.space.com/scienceastronom...th_000224.html
http://www.space.com/scienceastronom...ve_010207.html

[roomwithamoose]

I don't even think we'll be humans in a few billion years, but it's cool to read about!

[spyder003]

Yep, I believe mankind will destroy itself long before we have to worry about exploding stars.

[juppy]

Coppertone better start working on that SPF 60,000 sunscreen now so we'll be ready by then. Nice article.

[ric449]

Billion years? I believe we would have found a habitable planet by then, at the rate space exploration is advancing.

[Alienware_Dude]

Hmmm, by "swollen stars" I thought you meant Oprah Winfrey.

[Redfallon]

Originally Posted by Alienware_Dude Hmmm, by "swollen stars" I thought you meant Oprah Winfrey.

LMAO

[Confused]

Originally Posted by Alienware_Dude Hmmm, by "swollen stars" I thought you meant Oprah Winfrey.

True a few years ago. But she has lost a lot of weight and is looking very good now.
Chas

[homer15]

Originally Posted by juppy Coppertone better start working on that SPF 60,000 sunscreen now so we'll be ready by then. Nice article.

i think we could pretty much just put wall spackle on our skin...

[GaryRouth]

If you pickup an old copy of the planetarium program "RedShift" (there are several versions) in the $5 bin at your local computer store, it has nice animations of life cycles of various sorts of stars, all with the wonderfully pleasant & scientific-sounding BBC-type narration accompanying the data. [As you watch the Red Giant expand, just imagine the Earth as the little speck going Poof!]

From the looks of the article, it's a refinement of a fairly old theory. But it does fit under the category of "Earth-shattering" news, huh [well, it might not be news for another few billion years, but why quibble]

[toomyg]

Originally Posted by juppy Coppertone better start working on that SPF 60,000 sunscreen now so we'll be ready by then. Nice article.

LoL

imagine how much it would cost by then

[Alienware_Dude]

Originally Posted by Confused True a few years ago. But she has lost a lot of weight and is looking very good now. Chas

Yeah, you're right, it's just the whole "car giveaway" put me in a bad mood RE: Miss Winfrey.

[Confused]

Originally Posted by Alienware_Dude Yeah, you're right, it's just the whole "car giveaway" put me in a bad mood RE: Miss Winfrey.

I had a lot of good thoughts for her when I first heard about the car giveaway. Helping people is always good. But then I found out GM donated the cars and it kinda put me off. She's getting a lot of postive press that I think should be directed towards GM. Granted it was her show that came up with the idea, did the research to identify those in need and arranged the whole thing. I just think GM could have gotten a little more praise.
Chas

[Alienware_Dude]

My gripe is more towards the recipients. I read that one woman had written Oprah asking for an H2. What the hell is wrong with people today where they need to be writing Oprah asking for a car?