Huge star explodes in brightest supernova yet seen

[Ziggy Stardust]

http://news.yahoo.com/s/nm/20070507/sc_nm/supernova_dc

Huge star explodes in brightest supernova yet seen

By Will Dunham Mon May 7, 5:21 PM ET

WASHINGTON (Reuters) - A gargantuan explosion ripped apart a star perhaps 150 times more massive than our sun in a relatively nearby galaxy in the most powerful and brightest supernova ever observed, astronomers said on Monday.

And there is one such star in our own Milky Way galaxy that appears to be on the brink of dying in just such a supernova.

The exploding star's dramatic death may have come in a rare type of supernova reserved for "freakishly massive" stars that astronomers had speculated about but never previously witnessed.

The supernova, designated as SN 2006gy, occurred 240 million light years away in a galaxy called NGC 1260, and was studied using observations from NASA's orbiting Chandra X-ray Observatory as well as earthbound optical telescopes.

The explosion occurred long ago but was detected last year after its light traveled many, many trillions of miles (km) before it could be observed from Earth.

"That sounds far away but it's actually quite nearby on the vast scale of the universe," astronomer Nathan Smith of the University of California at Berkeley, who led the research, told a news conference.

The supernova was discovered in September 2006, and stands as far and away the most powerful and brightest ever observed, Smith said.

"In fact, even after the better part of a year, well after 200 days, it has faded somewhat but it's still about as bright as a normal supernova at its peak," Smith said.

A supernova marks a star's death in a spectacular explosion. Scientists say these events play a crucial role in creating heavy elements through nuclear fusion and synthesis and then expelling them into space, seeding the cosmos with metals.

The scientists ruled out a possible alternative explanation that what they were witnessing was the explosion of a white dwarf star with a mass only a bit more than the sun.

OBLITERATED CORE

Astrophysicist Mario Livio said the supernova may have resulted from a type of explosion mechanism that had existed only in theoretical calculations. He said the first generation of stars in the universe may have died in such a manner.

In a normal supernova, the core of a star collapses when it exhausts its fuel, and forms either a neutron star or a black hole, with scant heavy elements blown into space.

But this supernova appears to be the result of the core not collapsing but being obliterated in an explosion blasting all its material into space, the scientists said.

Dave Pooley of the University of California at Berkeley said this star appears similar to Eta Carinae, a star perhaps 100 to 120 times the mass of the sun located 7,500 light years away within the Milky Way. There has not been a supernova in our galaxy in more than 400 years, Pooley said.

A light year is about 6 trillion miles, the distance light travels in a year.

If Eta Carinae were to burst into a supernova, Pooley said, "It would be so bright that you would see it during the day, and you could even read a book by its light at night."

Livio said Eta Carinae had an incredible eruption during the 19th century that left it in an hourglass shape. He said it could explode at any time.

"This could happen tomorrow, it could happen 1,000 years from now," Livio said. "Is there a risk to life on Earth as a result of this explosion? Well, not very likely."

Livio said Earth could be affected if there were a gamma ray burst that potentially could harm the atmosphere and life, but the chances of this aiming directly at Earth are slim.

Space kicking butt kicks butt.

 

[El_Machinae]

Supernovas are where all our heavier elements come from. Until we crack fusion, they're the greatest source of wealth out there.

I think of them as money-making machines

 

[The Last Conformist]

Here's hoping Eta Carinae goes off soon

 

[Bozo Erectus]

Well you know what they say about supernovas. Whenever one explodes, it means a Savior has been born somewhere. Lets wish him luck, wherever, or whatever he is.

 

[Ziggy Stardust]

If Eta Carinae were to burst into a supernova, Pooley said, "It would be so bright that you would see it during the day, and you could even read a book by its light at night."

Meaning you wouldn't need lights at night, which would save energy, which would mean that the supernova might have an impact on Earth even if we're not hit by the gamma ray. If that happens we wouldn't need any lights anymore as well.

 

[Turner]

Here's hoping Eta Carinae goes off soon

Don't you mean within the last 8000 years or so ago?

 

[El_Machinae]

Meaning you wouldn't need lights at night, which would save energy, which would mean that the supernova might have an impact on Earth even if we're not hit by the gamma ray. If that happens we wouldn't need any lights anymore as well.

We certainly would be wishing we'd pumped more CO2 into the atmosphere, just to get more water vapour up there.

 

[bigdog5994]

when stars explode in our own galaxy doesn't that mean we get hit by a gamma ray burst that kills everything on our planet?

 

[Ziggy Stardust]

when stars explode in our own galaxy doesn't that mean we get hit by a gamma ray burst that kills everything on our planet?

The ray shoots out on two ends. It has to aimed directly at us, which luckily has a very small chance.

The ray here is exagerated in size, and I don't think it diverts.

 

[Turner]

The Crab Nebula is only about 6,300 light years away. Galactically speaking, pretty close.

 

[JohnRM]

Well you know what they say about supernovas. Whenever one explodes, it means a Savior has been born somewhere. Lets wish him luck, wherever, or whatever he is.

Let there be light?

 

[Ziggy Stardust]

Let there be rocks!

And it came to pass
That rock 'n' roll was born.

 

[Bozo Erectus]

Let there be light?

Somewhere, on some distant, unknown planet, Three Wise Beings, after seeing the new star in the night sky, are beginning an epic journey...

 

[Turner]

It's The Star!

 

[Bozo Erectus]

It's The Star!

Bingo! I was wondering who would make the connection with the classic Clarke story

 

[Turner]

Anyone who wants to read it, the wiki article linked has a link to the story online....

 

[Syterion]

OH MY GOD WERE ALL GONNA DIE!




I assume you mean huge star explodED many years ago.

 

[Catharsis]

Huge star explodes in brightest supernova yet seen

Aww, I thought it was going to be about Roseanne Barr.

 

[bhsup]

when stars explode in our own galaxy doesn't that mean we get hit by a gamma ray burst that kills everything on our planet?

Did this post make anyone else think of Sarah Conner in Terminator 2?
"Anybody not wearing 2 million sunblock is gonna have a real bad day. Get it?"