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I don't claim to have any particular expertise on what they tried to do in that video specifically, but I did notice the scale in the title said "(200 AU View)". I don't know if this means 200AU diameter and 100AU radius or what but in any case I think Jupiter is only about 5AU from our sun so I didn't get the impression they were trying to show objects particularly close to the star given the scale.
The simulation in the video seems to show what would be attempts to generate large planets close to the host star, which was a little bit of a confusion to astronomers when they observed jupiter+ sized planets right next to hosts as the 'calm and peaceful' style of planetary formation that we had mostly been working out didn't fit that.
Your opinion that more solar systems formed in a more chaotic manner than our own would seem to have some evidence supporting it, in the form of both computer simulations (1st link) and observations (2nd link):
Formation of the objects in the video seems to be a much more chaotic system, which is also possible, I would hazard a guess that our solar system is not that uncommon, but more systems probably formed in a more chaotic manner (my opinion) and do show clearly how matter can be ejected from a proto-planetary disc.
Even our solar system formation was pretty chaotic if the hypothesis about the formation of Earth's moon from a collision is true, in which case there would likely have been other collisions also. But I don't think any of that is incompatible with the planets forming from a proto-planetary disk.
EVANSTON, Ill. --- Prevailing theoretical models attempting to explain the formation of the solar system have assumed it to be average in every way. Now a new study by Northwestern University astronomers, using recent data from the 300 exoplanets discovered orbiting other stars, turns that view on its head.
The solar system, it turns out, is pretty special indeed. The study illustrates that if early conditions had been just slightly different, very unpleasant things could have happened -- like planets being thrown into the sun or jettisoned into deep space.
Using large-scale computer simulations, the Northwestern researchers are the first to model the formation of planetary systems from beginning to end, starting with the generic disk of gas and dust that is left behind after the formation of the central star and ending with a full planetary system. Because of computing limitations, earlier models provided only brief glimpses of the process.
The researchers ran more than a hundred simulations, and the results show that the average planetary system's origin was full of violence and drama but that the formation of something like our solar system required conditions to be "just right."
I agree the craters on the moon show evidence of a violent past but apparently even so our solar system may be atypical in being less violent and chaotic than the majority of solar systems.
New observations of dust around young stars suggests collisions of large asteroid-like objects and fledgling planets are frequent. But that doesn't likely stop the formation of rocky planets like Earth, a process that may well be common, the results suggest.
Based on the violent past of our own solar system, many astronomers had assumed planet formation was a chaotic process involving a lot of smash-ups. The new observations of 266 stars confirm that view and provide new details about just how wild things are.
"It's a mess out there," said George Rieke of the University of Arizona. "We are seeing that planets have a long, rocky road to go down before they become full grown." ...
The process is not always smooth. Our Moon is thought to have formed when a Mars-sized object hit Earth shortly after our planet gathered itself together. For a few hundred million years thereafter, impacts of huge asteroids rocked all the worlds of the inner solar system. Craters on the Moon serve as a record of that chaotic time.
eh no thats what i,m not saying at all,what i,m saying is scientists have came out and said things are impossible when in last few years they have been proved wrong.
reply to post by sparky31
Not sure that I understand what are you suggesting?
Should scientist stop with research as there might be something elsewhere that might prove it wrong?!
Interesting approach, thankfully our ancestors did not think that way or we still would wonder if there is some other way to create fire...
I skimmed over the posts. I was taught several years ago when I took an Astronomy course, that an object such as Jupiter would need about 75 times the mass of Jupiter to have sustained fusion reactions at the core. At only 11 times the mass, obviously it's not big enough. Interesting find though. I was wondering if they still taught the same number in Astronomy classes but most people do not take an Astronomy class in college. I heard I took the hardest to pass teacher and I was the only student taking the course as an elective course. I studied it a lot more than I thought would be necessary. It was one of the best classes I took I thought. I learned about fusion, meteorology, and basic science or what science thought were the facts at that point in time. To sustain fusion, an object needed a minimum mass about 75 times the mass of Jupiter. Anything less would not have the gravitational pressure to achieve sustained fusion.
Nice find. Thanks for posting.
Elusive brown dwarfs, the missing link between gas giant planets like Jupiter and small, low-mass stars, have now been "fingerprinted" by UCLA astronomy professor Ian S. McLean and colleagues, using the Keck II Telescope at the W.M. Keck Observatory in Hawaii.
Brown dwarfs are failed stars about the size of Jupiter, with a much larger mass but not quite large enough to become stars. Like the sun and Jupiter, they are composed mainly of hydrogen gas, perhaps with swirling cloud belts. Unlike the sun, they have no internal energy source and emit almost no visible light. Brown dwarfs are formed along with stars by the contraction of gases and dust in the interstellar medium, McLean said. The first brown dwarf was not discovered until 1995, yet McLean suspects the galaxy is teeming with them.
i,m saying just cause some scientist says it can,t be doesn,t mean they actually know for fact but we,r suppose to accept everything they say.
200AU view means 200AU view. I was referring to orbits since the animation shows protoplanet orbits.
^ 200 AU diameter what? One could say distance from a star but not diameter. No such planet has such a diameter lol.. You know 200 AU ~ 3x10^10 km (2.99x10^8)
What do you mean undiscovered process?
You know how neutrinos are observed in detectors around the world right? Heard of Super Kamiokande?
It can occur by charged current and neutral current and charge current quasi-elastic scattering. This is not unknown or mysterious, for you to write it as such is a very big misrepresentation and a clear sign of how much you are simply repeating things you dont really understand.
A neutrino comes in and interacts with the nucleus or atomic shell electrons and it can either scatter something, or it can create a lepton (if the neutrino has enough of the rest mass energy) So yes it is possible for the Earth to accumulate some mass via neutrinos.
Though if you were to do a calculation of exactly the rate, I would hazard a guess that it is loosing its atmosphere at a faster rate.
Nope I finished my undergrad many years ago, I got a PhD in Particle Physics (Experimental as opposed to theoretical) and am now a postdoc working on a dark matter experiment
What we don't know is light-years away from what we do know, eh?
Scientific knowledge is cool...but its arms are too short. The vastness of the cosmos and the mystery of consciousness will always leave us floundering in a sense of wonder. And many steps behind seems to be the best guess.
edit on 5-12-2013 by The GUT because: (no reason given)
I understand and know things you will never understand or know.
A guess... A guess is all you will be capable of until you visit the center of the Earth, or do another experiment which I can guarantee you are unfamiliar with. Also, don't forget other types of energy.
That's great. You have proven you know how to memorize text books with other people's discoveries. What have you discovered lately?