Planets form and obtain their compositions in disks of gas and dust around young stars. The
chemical compositions of these planet-forming disks regulate all aspects of planetary …

Cometary nuclei contain the least modified material from the formative epoch of our
planetary system, and their compositions reflect a range of processes experienced by …

Context. The inner regions of the envelopes surrounding young protostars are characterized
by a complex chemistry, with prebiotic molecules present on the scales where …

Preliminary analyses of asteroid Ryugu samples show kinship to aqueously altered CI
(Ivuna-type) chondrites, suggesting similar origins. We report identification of C-rich …

Isotope abundance ratios have an important role in astronomy and planetary sciences,
providing insights into the origin and evolution of the Solar System, interstellar chemistry and …

Context. One of the important questions of astrochemistry is how complex organic
molecules, including potential prebiotic species, are formed in the envelopes around …

Aims. Photodissociation by UV light is an important destruction mechanism for carbon
monoxide (CO) in many astrophysical environments, ranging from interstellar clouds to …

New measurements of 12 C/13 C ratios in Galactic molecular clouds have been conducted
using the N= 1→ 0 transition of the CN radical. This species is unique in that it has extensive …

The introduction of chemistry into astronomy is relatively recent and can be dated back to
about half a century ago, when molecules were discovered in space. In the 1930s it was …

The present-day state as well as the history of isotope organic geochemistry is reviewed.
Theoretical aspects of isotope fractionation in a system of complex organic molecules …