chris Posted July 9, 2002 Share Posted July 9, 2002 I read in last month discover magazine about how scientists can only explain the odd orbit of the planet neptune and pluto, is that there is a very large planet out there that distorts them. Now, for some time I have accepted this theory. But in this months, it describes a galaxy on the collapse 50 billion light years away. Now, it makes me wonder. Pluto is no where near 50 billion light years. It's not even a billion, So, if this theroy was to be true, This planet would have to be big enough to attract them. But, if we can see 50 billion light years away, and we havent found this 10th planet, it would have to be hard to fathom the size of this planet. Link to comment Share on other sites More sharing options...
Guest Unregistered Posted July 9, 2002 Share Posted July 9, 2002 We can't see 50,000,000,000 light years away, the current universe is estimated between 12 and 15 billion years old :/ Link to comment Share on other sites More sharing options...
fafalone Posted July 9, 2002 Share Posted July 9, 2002 Depends on the theory. Farthest galaxy we've seen so far is 14 billion light years away. There could be more, certainly if a galaxy is that far away and we saw it already formed, the universe is at least a couple billion older. And of course the latest theory says the universe is trillions of years old. Link to comment Share on other sites More sharing options...
chris Posted July 9, 2002 Author Share Posted July 9, 2002 Ok, i found the discover magazine, (March 2002). its not 50. that was a guess cause i was to lazy to look for it. but for who ever signed up. heres the real distance. (4.2 billion light years) k? happy. there Link to comment Share on other sites More sharing options...
Halogen Fisk Posted July 15, 2002 Share Posted July 15, 2002 Originally posted by chris But, if we can see 50 billion light years away, and we havent found this 10th planet, it would have to be hard to fathom the size of this planet. The big factor here is stars (hence galaxies) generate lots of light. Any planet beyond the orbit of Pluto would only reflect light, & not much out there to reflect. As a metaphor: It's easier to find someone at night if they're holding a torch! Link to comment Share on other sites More sharing options...
blike Posted July 15, 2002 Share Posted July 15, 2002 Very good point, Halogen Fisk Link to comment Share on other sites More sharing options...
Sayonara Posted July 21, 2002 Share Posted July 21, 2002 Originally posted by chris Now, it makes me wonder. Pluto is no where near 50 billion light years. It's not even a billion. Significantly less than one, in fact. But everyone else already answered the question. Link to comment Share on other sites More sharing options...
Radical Edward Posted July 21, 2002 Share Posted July 21, 2002 I can't see the link between a planet just outside the orbit of pluto, and a galaxy 50 billion light years away... or however far it is. Link to comment Share on other sites More sharing options...
blike Posted July 21, 2002 Share Posted July 21, 2002 I think he was saying if we can see that, why can't we see the planet. Link to comment Share on other sites More sharing options...
Sayonara Posted July 21, 2002 Share Posted July 21, 2002 Originally posted by Radical Edward I can't see the link between a planet just outside the orbit of pluto, and a galaxy 50 billion light years away... or however far it is. He wanted to know why we can see the galaxy but not the planet. Link to comment Share on other sites More sharing options...
Radical Edward Posted July 21, 2002 Share Posted July 21, 2002 >_< .. oh heh, I get it now, thanks Link to comment Share on other sites More sharing options...
chris Posted July 28, 2002 Author Share Posted July 28, 2002 yes thats it! but fisk did bring up a good point. But wouldn't we be able to see the outline of one if we are looking at it with bright objects behind it? Link to comment Share on other sites More sharing options...
Radical Edward Posted July 28, 2002 Share Posted July 28, 2002 you mean an eclipse... yes you would, be able to see it's shadow if it passed infront of, say, a star (this is one of the methods being used to look for planets, and other large objects like brown dwarves, black holes etc) but you would have to be looking in the right direction at the right time though.... Link to comment Share on other sites More sharing options...
chris Posted July 28, 2002 Author Share Posted July 28, 2002 very true. But still thats a way. And black holes move? i thought they were stationary.. interesting. Link to comment Share on other sites More sharing options...
Radical Edward Posted July 29, 2002 Share Posted July 29, 2002 oh black holes move, spin and allsorts - they would, since they are a prediction of general relativity, which in it's simple form - ignoring gravity and acceleration (Special Relativity) relies on the fact that there is no absolute motion - all motion is relative. Link to comment Share on other sites More sharing options...
chris Posted July 29, 2002 Author Share Posted July 29, 2002 can a black hole destroy matter? Link to comment Share on other sites More sharing options...
Radical Edward Posted July 29, 2002 Share Posted July 29, 2002 not exactly. they are information sinks, afaik destroying all information except charge, mass and angular momentum. there may be a couple of other quantum numbers that remain. I can't think of them off hand though if they are conserved, but I doubt it (things like boson number, lepton number etc) Link to comment Share on other sites More sharing options...
chris Posted July 29, 2002 Author Share Posted July 29, 2002 so what happens to the matter? Link to comment Share on other sites More sharing options...
Radical Edward Posted July 31, 2002 Share Posted July 31, 2002 in what way? Link to comment Share on other sites More sharing options...
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