[Robert A Cook PE]

Er, yes. But - where are the other 10^40 left-over superN's?

My hand, about a kg, would need some 10^30 atoms, but (under conventional theory at least) you can't assume that the original superN was exactly symmetrical with our solar system's center of mass.

Or do you have to? Do we have to assume that this superN stayed stable enough long enough at exactly the center of our solar system's cloud - and the observed superN burned out in only a few weeks - to burn enough atoms to form our planets as we know them?

Further, observed supernova's eject matter - far too great a distance (Crab nebula is never going to reform into planets!) for the newly-formed nebula's to re-condense into the same system that they started from.

[neverdem]

http://hyperphysics.phy-astr.gsu.edu/hbase/hframe.html

I found it to be a handy link.