Newsgroup: it.media.tv
Titolo: Spazio 1999

http://www.sciencedaily.com/releases/2012/03/120322113604.htm
 
 
Runaway Planets Zoom at a Fraction of Light Speed
 
ScienceDaily (Mar. 22, 2012) — Seven years ago, astronomers boggled when 
they found the first runaway star flying out of our galaxy at a speed of 
1.5 million miles per hour. The discovery intrigued theorists, who 
wondered: If a star can get tossed outward at such an extreme velocity, 
could the same thing happen to planets?
New research shows that the answer is yes. Not only do runaway planets 
exist, but some of them zoom through space at a few percent of the speed 
of light -- up to 30 million miles per hour.
"These warp-speed planets would be some of the fastest objects in our 
galaxy. 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," said astrophysicist 
Avi Loeb of the Harvard-Smithsonian Center for Astrophysics.
"Other than subatomic particles, I don't know of anything leaving our 
galaxy as fast as these runaway planets," added lead author Idan 
Ginsburg of Dartmouth College.
Such speedy worlds, called hypervelocity planets, are produced in the 
same way as hypervelocity stars. A double-star system wanders too close 
to the supermassive black hole at the galactic center. 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.
For this study, the researchers simulated what would happen if each star 
had a planet or two orbiting nearby. They found that the star ejected 
outward could carry its planets along for the ride. The second star, as 
it's captured by the black hole, could have its planets torn away and 
flung into the icy blackness of interstellar space at tremendous speeds.
A typical hypervelocity planet would slingshot outward at 7 to 10 
million miles per hour. However, a small fraction of them could gain 
much higher speeds under ideal conditions.
Current instruments can't detect a lone hypervelocity planet since they 
are dim, distant, and very rare. However, astronomers could spot a 
planet orbiting a hypervelocity star by watching for the star to dim 
slightly when the planet crosses its face in a transit.
For a hypervelocity star to carry a planet with it, that planet would 
have to be in a tight orbit. Therefore, the chances of seeing a transit 
would be relatively high, around 50 percent.
"With one-in-two odds of seeing a transit, if a hypervelocity star had a 
planet, it makes a lot of sense to watch for them," said Ginsburg.
Eventually, such worlds will escape the Milky Way and travel through the 
intergalactic void.
"Travel agencies advertising journeys on hypervelocity planets might 
appeal to particularly adventurous individuals," added Loeb.
The research will be published in the Monthly Notices of the Royal 
Astronomical Society, in a paper authored by Idan Ginsburg, Avi Loeb, 
and Gary Wegner (Dartmouth College).


Se elimini l'impossibile, quello che rimane, per quanto improbabile, deve 
essere la verità 
 
 

James T.Kirk ha usato la sua tastiera per scrivere :

Sherlock Holmes o Spock, dipende dai gusti :-)
 
-- 
Ciao
Deimos
 
I Guerrieri della Mephisto
http://www.grecoegrecoeditori.it/libro.php?libro=434
 
 
 

 million miles per hour.......
 
Magari ne metto qualche accenno nel prossimo romanzo :-)
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Secondo te? :-) 
 
 

James T.Kirk ci ha detto :
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Secondo i NOSTRI gusti il secondo. C'ho preso?
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 :-)
 
Dottori, è grave essere appassionati di entrambi?!?
 
-- 
Roberto Rosoni
 
Good night, and good luck.


No, entrambi terapeutici contro la dipendenza da GF & similia... :-P 
 
 

 No, entrambi terapeutici contro la dipendenza da GF & similia... :-P
 
Cos'è GF?


 :-)
 
Grande fratello & simili miserie televisive... 
 
 

Nel suo scritto precedente, James T.Kirk ha sostenuto :
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Era ironico. Comunque, mo vanto di non aver MAI visto neanche una 
puntata del gf. Anzi, per la precisione, neanche 3 minuti consecutivi.
E questo vale per tutti i programmi spazzatura simili.
Mi sa che su questo punto siamo sulla stessa "orbita".


 :-)
 
Meno male che qualcuno ancora ragiona coi suoi neuroni.
:-)
 
 

 :-)
 
Mi sa che ci stiamo estinguendo :-O
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