The other thread in here on where heavy elements come from got me thinking (always a dangerous prospect):
A sun fuses hydrogen into heavier and heavier elements till it can fuse no longer. In some cases the star goes supernova and creates the remaining elements on the periodic table and scatters it all back into space.
If previous stars ate all the hydrogen how does a new star coalesce out of the nebula (assuming the nebula is the remains of a previous star)? I mean, shouldn’t the nebula be seriously lacking in hydrogen?
Once a solar system starts to form why does the star get mostly hydrogen? I’m sure it gets all sorts of stuff but I assume it is predominantly hydrogen. The planets seems to get most of the heavier elements and not much hydrogen (relative to a star that is…they still get plenty of hydrogen too but they get more of the heavy stuff instead).
Shouldn’t a proto-star’s gravitational pull yank on heavy stuff even more than the light stuf thus gathering more in?
My WAG is it all has something to do with the spinning of the solar system but I don’t know that the same dynamics apply out there as a spinning system would on earth (throwing heavier stuff to the outside…lighter stuff on the inside). Also, if this spinning is the reason shouldn’t gas giant planets be closer in to the sun and increasingly rocky planets on the way out to the edge of the system? If that were the case then you wouldn’t see something like our own solar system.