The isotope distribution throughout the universe does vary considerably from spot to spot although on much larger scales the universe is remarkably
homogeneous.
You should read up on 'nucleosynthesis'. Heavier elements cannot be synthesised in stars, only in the intense pressure that results from the
implosion/explosion of a giant dying star, what Endi calls correctly a 'supernova', can the intense repulsion between heavier nuclei be overcome and
result in the fusion into an even heavier element like U.
We're all star dust and the Universe is the ultimate recycling machine. It's believed our own star is second, possibly third generation...
[Edited on 15-10-2011 by blogfast25] |