Lloyd wrote: There are quite a few stars within 100 ly. Have you concluded that all or many of those stars were formed in the same GMC implosion that formed the Sun?
I don't know what defines the limits of GMCs, but apparently, any number of stars might form within the same GMC.
willendure wrote: The energy of the sun comes mostly from the initial energy of the dusty plasma that formed it, and not from external currents?
That's correct.
willendure wrote: Find the lightest star known, and use its estimated mass to tell you what the minimum pressure is, and what its approximate collapse velocity is. Then you have the minimum pressure empirically, and can form a hypothesis as to why it takes that value from there.
Some of us believe that planets, such as the Earth, were once stars, and that all we have left is the heavy-element core. If that's true, we could set the limits considerably lower than the smallest known star. Thinking...
Lloyd
Re: CFDL solar model passes another test
CC said: Some of us believe that planets, such as the Earth, were once stars, and that all we have left is the heavy-element core. If that's true, we could set the limits considerably lower than the smallest known star. Thinking...
Do you mean you don't think planets could form directly in a GMC implosion? Do you mean neither rocky nor gas giant planets could form directly? But that they can only form from a decaying star? I thought it depended on whether more matter is being received than is being radiated away. If much matter were falling in on a gas giant planet, could it become a star?
CharlesChandler
Re: CFDL solar model passes another test
Lloyd wrote: Do you mean you don't think planets could form directly in a GMC implosion? Do you mean neither rocky nor gas giant planets could form directly? But that they can only form from a decaying star? I thought it depended on whether more matter is being received than is being radiated away. If much matter were falling in on a gas giant planet, could it become a star?
I believe that all spherical aggregates formed in the implosion of some portion of a GMC. I believe that it takes a certain amount of force in that implosion to invoke electron degeneracy pressure, which creates charged double-layers that latch onto the matter, and prevent the otherwise inescapable rebound that would have re-dispersed the matter. Now, some objects are large enough, and imploded violently enough, to glow brightly. Other objects might not glow quite so brightly. And with time, even the bright ones get dim, as they cool down. This produces what we call planets. But like Jeffrey says, it isn't a difference in kind — it's a difference in age and/or size.
