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Joined: Feb 2007
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The latest and greatest simulation of our evolving universe, commencing 12 million yrs after the Big Bang: http://www.youtube.com/watch?v=TPvHVtX1CBU&This is a testament to current astrophysics theory, to ever increasing predictive power of computers, and to achievements of the computer programmers.
"Time is what prevents everything from happening at once" - John Wheeler
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It's a testament to a lot of computer graphics power 
I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.
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Superstar
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Lots of high-power computer graphics and lots of good algorithms. It's interesting that it came up with something comparable to real space. Lots of hard work went into that simulation.
If you don't care for reality, just wait a while; another will be along shortly. --A Rose
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I would say that the truly remarkable aspect of this is not the quality and detail of visual presentation, as wonderful as that is. What's really breathtaking is: the physical laws and conditions extant 12 million yrs after the Big Bang - which have been provisionally determined by a host of observations of the current state of the universe, thence by mathematical extrapolation backward in time - have been encoded into binary computer language; the program was left to run for several months, constructing the physical evolution wrought by a mind-bogglingly vast array of interacting causes and effects over a virtual span of nearly 14 billion yrs; the result is a virtual universe which very closely resembles the observed universe.
Indeed, Rose. Lots of good algorithms.
"Time is what prevents everything from happening at once" - John Wheeler
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a star looses mass over time.
I wonder how the simulation simulates the changes in velocity
of all of the stars as they lose mass.
momentum = mass x velocity
if mass decreases then velocity must increase.
3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.
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a star looses mass over time.
I wonder how the simulation simulates the changes in velocity
of all of the stars as they lose mass.
momentum = mass x velocity
if mass decreases then velocity must increase.
Remember that as mass is lost the momentum of that lost mass will also be lost. So that the velocity doesn't necessarily have to increase. I think, without doing any calculations to make sure, that the loss of momentum due to the loss of mass would counter the increase in velocity. Bill Gill
C is not the speed of light in a vacuum.
C is the universal speed limit.
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a star looses mass over time.
I wonder how the simulation simulates the changes in velocity
of all of the stars as they lose mass.
momentum = mass x velocity
if mass decreases then velocity must increase. If mass decreases, momentum decreases (velocity does not change in the absence of an accelerating force). For example, if a bullet in flight were to split into two pieces, the sum of their combined momentum would be the same as for the bullet before the split, and the two pieces (aerodynamics aside) would continue with the same velocity. However, in the case of a star losing mass, particles are emitted - mostly photons, electrons and protons - but since they are emitted in all directions, the accelerating forces are nullified.
"Time is what prevents everything from happening at once" - John Wheeler
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Poul Great Great Question we have two type of mass 1 gravitation 2 inertia for Einstein gravitation mass = inertia mass ???? bulet ----> V ??? 1/2 bulet ---> V 1/2 bulet ---> V Gravitation is different if we have 2 pieces Inertia is the same INVERSE SQUARE LAW FOR GRAVITATION ! GRAVTATION NEAR PLACE WHERE IS BODY IS STRONGER !!! 
Last edited by newton; 05/14/14 09:33 PM.
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