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[CNN] Lonely, young planet drifting in space without a star - Page 3

post #21 of 28
Quote:
Originally Posted by kakik09 View Post

Really? Wasn't it because it wasn't big enough? I remember the mother jokes about Pluto being big enough for the scientists' mother biggrin.gif

Little of both apparently..

http://news.nationalgeographic.com/news/2006/08/060824-pluto-planet.html
Quote:
What Is a Planet Today?

According to the new definition, a full-fledged planet is an object that orbits the sun and is large enough to have become round due to the force of its own gravity. In addition, a planet has to dominate the neighborhood around its orbit.

Pluto has been demoted because it does not dominate its neighborhood. Charon, its large "moon," is only about half the size of Pluto, while all the true planets are far larger than their moons.

In addition, bodies that dominate their neighborhoods, "sweep up" asteroids, comets, and other debris, clearing a path along their orbits. By contrast, Pluto's orbit is somewhat untidy.

http://www.universetoday.com/13865/orbit-of-pluto/
Quote:
With its low mass, Pluto’s orbit is actually quite chaotic through its interactions with Neptune. Although astronomers can predict its position forward and backwards in time for a few million years, the uncertainties mount up, and it’s impossible to know where it’ll be in the far future.

As you probably know, Pluto is no longer a planet. This was a decision handed down in the 2006 meeting of the International Astronomical Union. Although Pluto orbits the Sun and has enough mass to pull itself into a sphere, it hasn’t cleared out its orbit.
post #22 of 28
Quote:
Originally Posted by Vagrant Storm View Post

Honestly, this was my first thought when I read the title...I mean, that is why Pluto lost its planet status. It didn't orbit directly around a sun.

Technically nothing does. Charon and Pluto orbit around their combined center of gravity which just happens to be located outside of Pluto. The Earth and Moon orbit around a shared center of gravity too, but it's located about 2000 miles from the core within the planet. Also, planets never had a strict definition at all until 2006. Ceres was referred to as the fifth planet for some time until astronomers discovered more and more large "planets" between Mars and Jupiter and reclassified them all as asteroids, similarly to how we've found more and more large objects in the Kuiper Belt (some significantly more massive than Pluto) today. I'm not sure where rogue planets like this fall, but those might just be non-stellar objects drifting through interstellar space.
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post #23 of 28
Thread Starter 
Quote:
Originally Posted by CynicalUnicorn View Post

Technically nothing does. Charon and Pluto orbit around their combined center of gravity which just happens to be located outside of Pluto. The Earth and Moon orbit around a shared center of gravity too, but it's located about 2000 miles from the core within the planet. Also, planets never had a strict definition at all until 2006. Ceres was referred to as the fifth planet for some time until astronomers discovered more and more large "planets" between Mars and Jupiter and reclassified them all as asteroids, similarly to how we've found more and more large objects in the Kuiper Belt (some significantly more massive than Pluto) today. I'm not sure where rogue planets like this fall, but those might just be non-stellar objects drifting through interstellar space.

I think the minimum definition had to do with being "round" due to self-gravity. Pluto is a bit irregular in shape and not quite round enough.
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post #24 of 28
Quote:
Originally Posted by DuckieHo View Post

I think the minimum definition had to do with being "round" due to self-gravity. Pluto is a bit irregular in shape and not quite round enough.

That could be due to tidal effects from Charon's relative mass. I don't think we have any precise measurements of much yet. And if you want to see a not-round planet, look at Saturn. It bulges by over 7000 miles at the equator, though it is a gas planet. Mars actually has a slightly bigger bulge than Earth yet is half the diameter. Ceres' is even bigger and I think is only a dwarf planet because of all the space rocks it hasn't accumulated/destroyed/captured/gravitational-slingshotted.
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post #25 of 28
Quote:
Originally Posted by CynicalUnicorn View Post

Technically nothing does. Charon and Pluto orbit around their combined center of gravity which just happens to be located outside of Pluto. The Earth and Moon orbit around a shared center of gravity too, but it's located about 2000 miles from the core within the planet. Also, planets never had a strict definition at all until 2006. Ceres was referred to as the fifth planet for some time until astronomers discovered more and more large "planets" between Mars and Jupiter and reclassified them all as asteroids, similarly to how we've found more and more large objects in the Kuiper Belt (some significantly more massive than Pluto) today. I'm not sure where rogue planets like this fall, but those might just be non-stellar objects drifting through interstellar space.

I think a little "wobble" is OK, but it has to be inside the planet. Once it moves out side the "planet" the body is then orbiting that center of gravity and not the star...or at least not directly. That was the main reason for the demotion of Pluto from my memory. This also relates pretty heavily to the ability to control the area around them as posted above. To be a planet you have to stay put for the most part and make things come to you. Heh, which is also dependent on the mass of the object. So perhaps that is the true classification criteria in all this after all...you just have to be big enough. Since if you are big enough then all of the above should happen too unless there is something highly unusual going on. Like binary or tertiary star systems passing planets to each other or their planets becoming moons of larger planets of another star and then getting pulled off buy a star to become a planet again which has been theorized as something that could happen...all sorts of craziness can happen out there.

Though if you get down to it...this rouge planet must orbit something...even if it is the center of its galaxy. Hmm...wouldn't that make it be its own "solar system" though? It just doesn't have a sun.
Edited by Vagrant Storm - 10/17/13 at 9:59am
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post #26 of 28
Quote:
Originally Posted by DuckieHo View Post

http://www.cnn.com/2013/10/10/tech/space-new-planet/index.html?hpt=hp_c3
Quote:
t's just a newborn in planetary terms, and it's drifting all alone in space without a star to orbit.
The solitary life of this newly discovered planet, with the catchy name PSO J318.5-22, has astronomers excited.


Nibiru has been found! tongue.gif
Lol Duckie! thumb.gif
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post #27 of 28
That's no planet...
post #28 of 28
Quote:
Originally Posted by Pr0xy View Post

That's no planet...

It's a space station!

Sorry I had to lol. tongue.gif
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