Comets 'are born of fire and ice'

Comets 'are born of fire and ice' The findings are very interesting and should teach us more on how our corner of the Galaxy originated, however ultimately we and our solar system are the progeny of previous suns... even in the Universe there is evolution. Especially on a elemental scale. As the Universe gets older it gets populated with heavier and heavier elements, maybe this is one way a "Big Crunch" will be initiated?