Presented at the workshop Isotopes in Astrochemistry: An Interstellar Heritage for Solar System Materials? Lorentz Center, Universiteit Leiden, December 5-9 2011.
The matter comprising the Sun and the planets, well as the comets and asteroids, originated in the dense core of an interstellar cloud over 4.6 billion years ago. The aim of the workshop will be to obtain a clearer picture of the fate of observed interstellar isotopic fractionation patterns as they were incorporated into the protosolar nebula. A major goal would be to ascertain which of the molecular isotopic signatures found in primitive Solar System matter are indicative of pristine interstellar molecules.