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Distant planetoid Sedna gives up more secrets
New Scientist ^ | 4/15/05 | Maggie McKee

Posted on 04/15/2005 11:23:49 PM PDT by LibWhacker

The distant planetoid Sedna appears to be covered in a tar-like sludge that gives it a distinctly red hue, a new study reveals. The findings suggests the dark crust was baked-on by the Sun and has been untouched by other objects for millions of years.

Sedna appears to be nearly the size of Pluto and was discovered in November 2003. It is the most distant object ever seen within the solar system and travels on an elongated path that stretches from 74 to 900 times the distance between the Sun and the Earth.

Astronomers have struggled to explain such an extreme orbit, but many believe a star passing by the Sun about 4 billion years ago yanked the planetoid off its original, circular course.

Now, observations by the same team that discovered Sedna suggest the object has since led an uneventful life. Infrared spectra taken with the Gemini Observatory in Hawaii show the surface of the planetoid contains little methane ice, found in significant amounts on Pluto, and little water ice, seen on Pluto’s moon, Charon. Hydrocarbon sludge

Chad Trujillo, the team's lead researcher at the Gemini Observatory, says collisions with other objects may have helped expose the icy interiors of Pluto and Charon and believes a lack of collisions might explain Sedna's ice-free surface.

He says Sedna, which is probably made up of an equal mixture of ice and rock, may be covered with a metre or so of hydrocarbon sludge. This sludge is produced when the Sun's ultraviolet radiation and charged particles alter the chemical bonds between atoms in the ice.

"You just get this big tangle of carbon and hydrogen bonds, which turns the surface dark like asphalt or tar," he told New Scientist. A similar "space weathering" process occurs on a 200-kilometre-wide object called Pholus, which lies near Saturn and is also very red. Less crowded environment

Scott Gaudi, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Massachusetts, US, says the new work supports previous theories showing Sedna evolved in a more distant, less crowded environment than Pluto and Charon’s. "Maybe it was lifted to its higher orbit early on and lived out there for a long time," he says.

But Gaudi recently discovered that, in at least one way, Sedna appears more conventional than previously thought. When Sedna was discovered, astronomers used a 1.3-metre telescope to observe the planetoid's period of rotation, concluding it rotated once every 20 days - an abnormally slow rate which they attributed to the gravitational tugs of a moon. But in March 2004, the mystery deepened when the Hubble Space Telescope failed to detect any moon.

Now, Gaudi and colleagues have taken more than 140 images of Sedna with a 6.5-metre telescope and found that actually Sedna rotates once every 10 hours. "Most things in the solar system rotate with periods of 10 hours or less, so this is what you’d expect," says Gaudi.

The study by Trujillo and colleagues will be published in an upcoming issue of the Astrophysical Journal.


TOPICS: News/Current Events
KEYWORDS: niburu; planet; planetoid; planetx; sedna; xplanets

1 posted on 04/15/2005 11:23:50 PM PDT by LibWhacker
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To: LibWhacker

If Pluto is a planet, denying Sedna its planetary rights is gross injustice


2 posted on 04/15/2005 11:39:18 PM PDT by eclectic (Liberalism is a mental disorder)
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To: LibWhacker
Astronomers have struggled to explain such an extreme orbit, but many believe a star passing by the Sun about 4 billion years ago yanked the planetoid off its original, circular course.

Now, observations by the same team that discovered Sedna suggest the object has since led an uneventful life.

At least Sedna hasn't been yanked around for a while and enjoys an uneventful life now. I felt better about Sedna until I read:

He says Sedna, which is probably made up of an equal mixture of ice and rock, may be covered with a metre or so of hydrocarbon sludge.

I know it's George Bush's fault that Sedna is covered with about 3 ft of sludge, but that's life in this solar system.

3 posted on 04/15/2005 11:59:37 PM PDT by xJones
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To: xJones

With the price of gas being what it is, I'm glad we're discovering more objects in the solar system that are covered with hydrocarbon sludge. Now we just have to give Halliburton the contract to retrieve it.


4 posted on 04/16/2005 12:13:16 AM PDT by mhx
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To: xJones
Just you wait till they start drilling for that sludge. There are no caribous there, but I still expect the greenpissers to raise a ruckus.
5 posted on 04/16/2005 12:16:17 AM PDT by GSlob
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To: GSlob
Just you wait till they start drilling for that sludge.ca There are no caribous there, but I still expect the greenpissers to raise a ruckus.

Drilling? Don't be silly, you skim it off the top. Think of a hydrocarbon 7-ll Slurpy. Of course, the 7-ll would be about 8 billion miles away....:)

6 posted on 04/16/2005 12:38:50 AM PDT by xJones
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To: LibWhacker
"You just get this big tangle of carbon and hydrogen bonds, which turns the surface dark like asphalt or tar,"

Great, a planet-size parking lot. Next step in the planet's evolution: Wal-Mart.
7 posted on 04/16/2005 12:56:43 AM PDT by billybudd
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To: eclectic

In re to Sedna, perhaps it's originally a member of the OX/IX globular clusters that orbit further out, and send killer comets into the inner solar system every 26 million years, as they pass THROUGH each other(on nearly identical orbits). 65 million years ago(dino-whacking asteroid)is 2 1/2 cycles ago. At least Brian Marsden thinks it(OX/IX)is a plausible explanation...


8 posted on 04/16/2005 1:08:45 AM PDT by timer
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To: LibWhacker
"...Sedna, which is probably made up of an equal mixture of ice and rock, may be covered with a metre or so of hydrocarbon sludge."

One yard thick, covering a planetoid with a what circumference. How many years worth of oil is that? No environmental concerns, off-planet harvesting, what's not to like?

9 posted on 04/16/2005 5:37:09 AM PDT by Jabba the Nutt (Jabba the Hutt's bigger, meaner, uglier brother. Good thing I have no spine, I'd have whiplash.)
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To: GSlob

You got it wrong. No drilling is required.

Think Eastern Kentucky...... think strip mining

The landscape will be destroyed!!!


10 posted on 04/16/2005 5:40:23 AM PDT by bert (Peace is only halftime !)
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To: eclectic
If Pluto is a planet, denying Sedna its planetary rights is gross injustice

Of course Pluto's status as a planet is still hotly debated. It could be a while before Sedna is properly renamed after a Roman or Greek diety.

11 posted on 04/16/2005 5:48:19 AM PDT by Drew68
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To: LibWhacker

Obscure, but Interesting Bump.


12 posted on 04/16/2005 5:55:37 AM PDT by DoctorMichael (The Fourth Estate is a Fifth Column!!!!!!!!!!!!!!!!!!!)
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To: eclectic

Pluto is called a planet only because of tradition.
Oops! I just now detected the barb. Poor Sedna – low self esteem. It will probably become a rogue.


13 posted on 04/16/2005 5:56:14 AM PDT by R. Scott (Humanity i love you because when you're hard up you pawn your Intelligence to buy a drink.)
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To: LibWhacker
The findings suggests the dark crust was baked-on by the Sun and has been untouched by other objects for millions of years.

Sounds like some of the stuff on the bottom of my oven.

14 posted on 04/16/2005 6:14:09 AM PDT by Logophile
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To: billybudd
Great, a planet-size parking lot. Next step in the planet's evolution: Wal-Mart.

...followed by a

15 posted on 04/16/2005 6:42:09 AM PDT by yankeedame ("Born with the gift of laughter and a sense that the world was mad.")
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To: Logophile
LOL! . . . We ought to send them a giant can of Easy Off.
16 posted on 04/16/2005 12:48:35 PM PDT by LibWhacker
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To: R. Scott
If Sedna cannot be granted planetary status in the confines of the Solar system, it should be relieved from its gravitational obligations to the Sun and allowed to seek better life elsewhere in the Galaxy. Free Sedna!
17 posted on 04/17/2005 12:50:27 AM PDT by eclectic (Liberalism is a mental disorder)
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To: eclectic

Here here!!


18 posted on 04/17/2005 3:09:48 AM PDT by R. Scott (Humanity i love you because when you're hard up you pawn your Intelligence to buy a drink.)
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To: KevinDavis; annie laurie; Knitting A Conundrum; Viking2002; Ernest_at_the_Beach; Mmogamer; ...
Note: this topic is from 4/15/2005. Thanks LibWhacker.
 
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19 posted on 09/01/2012 3:13:24 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/)
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