The ChETEC Action aims to tackle the following key open questions:

Early evolution of the universe:
- the lithium (Li-7) puzzle with respect to big bang nucleosynthesis
- the properties of the first stars and galaxy building blocks
Stellar evolution, explosions and the related nucleosynthesis:
- the impact of companion stars in multiple systems on their evolution and nucleosynthesis
- the progenitors and explosion mechanisms of type Ia, core collapse, and rarer, more exotic supernovae (gamma-ray bursts, electron-capture and pair-instability supernovae)
- the astrophysical site of the rapid neutron capture process (r process)
- the formation of the C13-pocket for the slow neutron capture process (s process)
- the role of neutrinos and their oscillations in explosions and ejecta composition
Cosmic and galactic gas composition and evolution:
- the Milky Way chemical evolution and assembly in the Gaia satellite era
- nucleosynthesis product ejection, mixing timescale and inhomogeneities in the ISM
- multi-dimensional and non-equilibrium effects in stellar atmospheres