Star formation by collapse of molecular clouds

[mosquitobight]

The solar system is a multibody problem, but the Sun is such a dominant body that our solar system can be approximated as a series of almost independent two-body problems. Furthermore, the average position of a planet over the course of its year would place its yearly average center of mass inside the Sun or very close to it. Therefore, averaged over thousands of years, the pull of the planets on each other would tend to cancel out, and the system would behave almost as if only the Sun has pull.

[ivandga]

this is really awesome!! wonder how long it took to calculations and everything!

[woxingma8]

But a 4 body problem is easy to balance, so just get yourself another body!

[heartlessvietboy]

You'd think we know how stars form.

[MisterDax]

Beautiful

[OntologicalQuandary]

Man I had the guy who made this (volker bromm) as a professor for an introductory astronomy course and he was a total fucking badass

[kos22us]

would it be fair to say that main sequence stars only not pre or post, are in color from lowest to highest the following : red,orange,yellow,white,blue-w­hite, and blue being the hottest ? are there any other colors of main seq. stars ? any input would be appreciated thanks

[watsisname]

@kos22us

You have it exactly right with star colors and temperature, and no, there's no other color for a main sequence star.  I recommend you google "HR diagram", which is a tool that astronomers use to classify stars in this way (color/temperature versus luminosity). Might be interesting for you. :)

[kobasica]

oh right, star formations cannot be observed since it takes millions of years just like evolution.. the resemblance is uncanny

[watsisname]

@kobasica

Are you suggesting that anything that takes longer than a few hundred years to happen is impossible to happen?

[adkinsjr]

Most bible fanatics don't believe anything that goes against the rigid dogma and teachings of the christain cult.

[watsisname]

@adkinsjr

Indeed. It's very sad to see. :/

[ActiveStorage]

ok. I have a question. Why our solar system is so stable?

3-body gravitational systems by definition cant achieve equilibrium. Yet we can observe this equilibrium just by looking at our own solar system.

So where this observable equilibrium according to this video's model\theory\simulation comes from?

thanks

[WZW1982]

@ActiveStorage I dont think the equilibrium you mention actually exists. i think the irregularities in the orbits of this solar systems celestial bodies are so minute that it would seem to have equilibrium. but it does not. should not be confused with stability however, the orbits are stable, temporarily, and changes are so slight that they will remain that way for eons. but eventually, that stability will come apart. and so will the solar system, like all do. its always changing. thats my guess

[watsisname]

@WZW1982: Very well said.

[ActiveStorage]

@WZW1982 then what are those irregularities you are talking about? thanks . argument "they will remain that way for eons" is not really an argument tho. peace

[WZW1982]

@ActiveStorage You stated that we can observe this equilibrium just by looking at our own solar system. I stated the orbits will remain stable for eons, but are not permanent, they are always changing ever so slightly. So my point is there is never true equilibrium like you stated by definition there cannot be. There is only stability for the amount of time before an orbit becomes radical enough to make a bigger change in the celestial bodies around it.

[Xaiano]

@WZW1982 a 3-body system is mathmaticaly impossible to balance and therefore any motion from any of the bodies within it inherantly causes chaos

[watsisname]

@ActiveStorage

I think you misunderstand what the 3-body problem is about. A 3-body problem implies 3 objects that strongly affect each other's orbits. It also discusses how, because of chaos theory, we cannot accurately predict the locations of those objects at a given time in the future.

The solar system is much more stable than the typical 3-body problem, but even then we cannot accurately predict the planet's locations far in the future. This is why ephemerids are always updated.

[ActiveStorage]

chaos theory is unable to account for partly (if not fully) stable and highly organized structures we see throughout the observable universe.

therefore gravity based computer models cant simulate all these stable and organized structures

[watsisname]

False.

Chaos theory states that a slight change in initial conditions in a complex system will result in different positions of the components of said system given enough passage of time.

This is not the same as saying we cannot understand or simulate such systems or that said simulations are flawed.

[Acrimonator]

That's becoming tiresome all these douche bags feeling the urge to show the world their ignorance...

Thanks for the video... Awesome simulation...

[Krandolph17]

Thats really awesome! no wonder there are so many billions of stars :)

[kobasica]

absolute crap. star formations have never been observed.

[Nightowlerthing]

you're an idiot.

[unc0nnected]

Did you also have troubles figuring out if the Dinosaurs were real or not in Jurassic Park?

[seanbrockest]

What's your point? This is a simulation of how gravity affects mass.

[fabbio8888]

WOW -9!

Yet you are right, there is a problem: collapsing gas will reach equilibrium. I a searching for an exlanation but I only find these simplified views suggesting that a gas will eventually trigger a star by collapsing. But it cannot work in this way alone. You can obtain thousands of degrees, not the millions required for fusion.

So, I need more information.

[Acrimonator]

Have you seen your birth ? Then you are not really here...

[cipher314]

Wow. That is so cool to see all the stars getting spit out of those transient density vortexes.

[geeleegoat]

That is absolutely incredible.

[ibruckelmann]

how much computational power do I need to do simulation myself? I'm guessing a super-computer, but you tell me.

[Perspektyva]

Appearantly this simulation is a result of ten million billion (10^16) flops(plural) which took 100.000 hours on 64 CPUS. One CPU proccesed 1/64*10^16 flops(pl) in 3.6*10^8 seconds witch means that it's computational power is 4.3*10^5 flops (floating point operations per second (speed)) per core.

[ibruckelmann]

thank you.

It's a lot, maybe in 20 years we'll be able to do this on our laptops.

[kassu09]

ha? wtf? thats just anime.... u dont need 64 cpus lol

[Perspektyva]

To play an *.flv? Yeah, you don't need a super computer, but to compile asimulation which is depicted in the flv you'd need something better, since to make a single frame you'd need to recalculate the position of each individual particle based on the positions of other particles. Having said that, my above calculations are wrong since I misunderstood the term "CPU hours", the whole calculation didn't take 100.000hrs it took 64 times less and the power of each core was 64 times bigger.

[kassu09]

aah... now i understand xD first i thought ppl are stupid lawl =)

[ablestmage]

cool story bro

[Imgumbydammit15]

This looks like a similar graphic from Windows Media Player. Where does the gravitational pull come from on exploding material, and with such a force to form a star? I might just be naive in my astrological physics, but it doesn't seem real to me, or maybe its just beyond real

[pacocrowley]

Astrological... LOL

Tons of maths and it looks like a graphic of WMP, yeah right.

[PonThePony]

Ugh. So many errors. 1. Astrology is not a science, it's reading star signs and such. 2. Gravity comes from the mass of each molecule in the cloud. There is an incredible amount of matter in there. The cloud was 1.2ly rwide at the start, and with a mass 50 times that of the sun.

[master1140]

You probably mean Astrophysics..and PonThePony has explained it all:P

[Sphacelate]

That is INCREDIBLE

[Civil44]

amazing video

[LeiMagnus]

that was awesome

[muffles12]

so this how to make new star systems of newborn galaxy that universe is expaining every second sooon it will 600 billion galaxy

[elxverde]

what?

[frankenbing]

amazing.

been looking for software on this