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Scientists tell of 'runaway' planets
UPI ^ | March 22, 2012 | UPI

Posted on 03/22/2012 11:14:22 PM PDT by U-238

U.S. scientists studying "runaway" stars tossed out of our galaxy at great velocities say they've confirmed the same thing can happen to planets.

The first runaway star was discovered seven years ago, heading out of the Milky Way at 1.5 million mph, and new research says planets must be doing the same thing -- at speeds up to 30 million mph, the Harvard-Smithsonian Center for Astrophysics reported Thursday.

"These warp-speed planets would be some of the fastest objects in our galaxy," astrophysicist Avi Loeb said. "If you lived on one of them, you'd be in for a wild ride from the center of the galaxy to the universe at large."

So-called hypervelocity planets are produced in the same way as hypervelocity stars, researchers said.

A double-star system wanders too close to the supermassive black hole at the galactic center, where strong gravitational forces rip the stars from each other, sending one away at high speed while the other is captured into orbit around the black hole.

The researchers modeled what would happen if each star had an orbiting planet or two and found the star ejected outward could carry its planets along for the ride, while a star captured by the black hole could have its planets torn away and flung into interstellar space at tremendous speeds.

"Other than subatomic particles, I don't know of anything leaving our galaxy as fast as these runaway planets," study lead author Idan Ginsburg of Dartmouth College said.

(Excerpt) Read more at upi.com ...


TOPICS: Science
KEYWORDS: astronomy; astrophysics; catastrophism; galaxy; interstellarspace; planet; rogueplanet; science; xplanets

1 posted on 03/22/2012 11:14:26 PM PDT by U-238
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To: SunkenCiv; KevinDavis

Ping


2 posted on 03/22/2012 11:16:04 PM PDT by U-238
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To: U-238

A runaway planet? Is it too early to put Romney on one?


3 posted on 03/22/2012 11:20:12 PM PDT by Bizhvywt
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To: U-238

I imagine if you were on one of those planets it would also become very cold, very quickly.

Great story though! I really like reading these sort of articles, it’s nice to get a break from politics once in a while :)


4 posted on 03/22/2012 11:20:54 PM PDT by NMCicero
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To: Bizhvywt

LOL


5 posted on 03/22/2012 11:21:12 PM PDT by U-238
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To: Bizhvywt
A runaway planet? Is it too early to put Romney on one? Can he have an Etch-A-Sketch to keep him company? :P
6 posted on 03/22/2012 11:22:04 PM PDT by NMCicero
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To: U-238

That’s 1/22 (or 4.48%) the speed of light... That’s pretty darn fast!


7 posted on 03/22/2012 11:23:17 PM PDT by DB
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To: U-238

It seems gravity can’t help me now,
I’m out too far, I’m spinning out
This time I’ve really led myself astray...

Runaway planet, never goin back...
Wrong way on a one-way track
Seems like I should be orbiting somewhere
Somehow I’m neither here nor there


8 posted on 03/23/2012 12:04:26 AM PDT by Boogieman
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To: DB

Still a far cry from the Star Trek “slingshot maneuver” we’ll need to pull off to go back to 2008 and stop Obama :(


9 posted on 03/23/2012 12:05:46 AM PDT by Boogieman
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To: DB
That’s 1/22 (or 4.48%) the speed of light... That’s pretty darn fast!

It's all relativistic. At that speed our four year, nominally 1461 day, presidential term would be time dilated to 1495 days. This current term feels much longer than that, more like two terms, which would require 19/22 c speed via time dilation. Thus this ***** President beats a ***** Hole.

10 posted on 03/23/2012 12:11:25 AM PDT by JohnBovenmyer (Obama been Liberal. Hope Change!)
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To: DB

Its being ejected by a supermassive black hole. Maybe some of these planets are still probably in orbit around their parent stars.


11 posted on 03/23/2012 12:23:32 AM PDT by U-238
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To: JohnBovenmyer

I agree with you.


12 posted on 03/23/2012 12:24:10 AM PDT by U-238
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To: U-238

We have a super massive black ***hole for a president.


13 posted on 03/23/2012 12:39:30 AM PDT by Bullish
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To: NMCicero; U-238
I imagine if you were on one of those planets it would also become very cold, very quickly.

I doubt that you would notice.

The torsional tidal forces exerted on the planet when it was torn away from its sun would be such that the mantel of the planet would be cracked like someone roll in a hard boiled egg between there palms. There would be little left on the surface of the planet uncrushed. The gravitational shear may tear the atmosphere from the planet.

14 posted on 03/23/2012 1:12:29 AM PDT by Pontiac (The welfare state must fail because it is contrary to human nature and diminishes the human spirit.)
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To: U-238

Space 1999 anyone?


15 posted on 03/23/2012 1:18:49 AM PDT by Ophiucus
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To: Bullish

ROFLMAO


16 posted on 03/23/2012 1:19:29 AM PDT by U-238
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To: NMCicero

If you want to make the story line plausible, you could posit the existence of high geothermal heat at the planet’s core making it somewhat warm but still, of course, dark on the surface.


17 posted on 03/23/2012 1:59:51 AM PDT by muir_redwoods (No wonder this administration favors abortion; everything they have done is an abortion x)
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To: U-238

I’m a-walkin’ in the rain,
Tears are fallin’ and I feel the pain,
Wishin’ you were here by me,
To end this misery
And I wonder—
I wah-wah-wah-wah-wonder,
Why,
Why, why, why, why, why she ran away,
Yes, and I wonder,
A-where she will stay-ay,
My little runaway,
Run, run, run, run, runaway.
Run, run, run, run, runaway.
Run, run, run, run, runaway.


18 posted on 03/23/2012 3:28:38 AM PDT by LRS ("This is silly! It can't be! It can't be!!" "Oh yes it is! I said you wouldn't know the joint.")
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To: Bullish

lol...


19 posted on 03/23/2012 3:52:33 AM PDT by sit-rep
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To: U-238

Sometimes I wopnder how much money is tossed at studying things we can do nothing about and really don’t matter in the great scheme of things.


20 posted on 03/23/2012 4:24:54 AM PDT by Venturer
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To: Bullish

That’s racist!


21 posted on 03/23/2012 4:27:00 AM PDT by John W (Viva Cristo Rey!)
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To: U-238
Maybe some of these planets are still probably in orbit around their parent stars.

Probably not. Be lucky if the tidal forces didn't tear the planet asunder, much less let its home star keep hold of it. The reason Saturn's rings don't coalesce into moons is tidal forces, the reason the material left in the asteroid belt doesn't coalesce into a planet is tidal disruption by Jupiter. Image what the tidal forces around a black hold must be like.

It's like a game of snap-the-whip with the outboard body being tossed into the void of intergalactic space, while inboard member is trapped in orbit around the black hole. Normally, when two bodies that are not gravitationally bound interact gravitationally, their orbits will be hyperboles, with each object being deflected from its original trajectory, but never encountering each other ever again. When three or more bodies are involved, things change. For example, when a comet comes near Jupiter on its path away from the sun, one of two things can happen. If it encounters Jupiter so that it passes behind Jupiter in his orbit, the comet will be accelerated by Jupiter and tossed into a higher orbit (while slightly decelerating Jupiter and lowering his orbit). In some cases the acceleration is enough to toss the comet completely out of the solar system. If the comet passes in front of Jupiter in his orbit, the comet will be retarded, and Jupiter will increase his orbital energy. In the case of Shoemaker-Levy 9, the comet was so retarded in a 1968 pass that it was captured by Jupiter and remained in a highly elliptical orbit around Jupiter until 1994, when this unstable orbit was perturbed (possibly by one of Jupiter's moons) just enough that it collided with planet. The shredding of Shoemaker-Levy into pieces was caused by tidal forces long before the collision.

When a double star, or a planetary system (systems which are already gravitationally bound) encounter a black hole, the outcome would, it seems to me, depend on whether or not the direction of their orbit around the black hole is in the direction of their orbit around each other, or counter to it. If it is in the same direction, tidal forces will tend to tear the two asunder, stressing and possibly breaking their gravitational bond. Depending on the original trajectory and mutual orbit, one of the bodies may be tossed out to the galaxy, "by the other body", in the same way that Jupiter tosses a comet out of the solar system, and the other body will lose kinetic energy and may even become gravitationally bound to black hole.

If on the other hand, the two were orbiting opposite the direction of their encounter with the black hole, tidal forces would bind them even more firmly, at least initially, until they reached the point in their hyperbolic orbit about the black hole of closest approach, after which tidal forces would pull them apart until as they left the influence of the black hole, their orbital state would be stored to what it had been before they encountered the black hole.

22 posted on 03/23/2012 4:46:11 AM PDT by Lonesome in Massachussets ("Jihad" is Arabic for "Helter-Skelter", "bin Laden" is Arabic for "Manson".)
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To: U-238
Its being ejected by a supermassive black hole.

That's racist!

23 posted on 03/23/2012 5:29:47 AM PDT by Thane_Banquo
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To: Lonesome in Massachussets

This is an absolutely good post!!!!!


24 posted on 03/23/2012 5:44:29 PM PDT by U-238
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To: U-238; 75thOVI; agrace; aimhigh; Alice in Wonderland; AndrewC; aragorn; aristotleman; ...

Thanks U-238, a two-list pingworthy topic.




25 posted on 03/23/2012 6:52:49 PM PDT by SunkenCiv (I come to bury Caesar, not to praise him)
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To: KevinDavis; annie laurie; Knitting A Conundrum; Viking2002; Ernest_at_the_Beach; Mmogamer; ...

Thanks U-238, a two-list pingworthy topic.
 
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26 posted on 03/23/2012 6:53:37 PM PDT by SunkenCiv (I come to bury Caesar, not to praise him)
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To: SunkenCiv

27 posted on 03/23/2012 7:28:45 PM PDT by BenLurkin (This is not a statement of fact. It is either opinion or satire; or both)
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To: BenLurkin

:’) You betcha! :’)


28 posted on 03/23/2012 9:55:23 PM PDT by SunkenCiv (I come to bury Caesar, not to praise him)
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