The near future of radio-astronomy is seemingly bright : the development of powerful radio-interferometers makes it possible to investigate new sources with unprecedented data volume and quality.

In coordination with LOFAR and as a pathfinder of the Square Kilometer Array, NenuFAR is a new instrument located at the Radioastronomy Station in Nancay, France. One of its scientific goals is to detect the cosmological 21cm signal of neutral hydrogen. Successfully doing so would open a new window on the epoch of the formation of the first stars in our Universe, the Cosmic Dawn.

The NenuFAR Cosmic Dawn Key Project is a joint effort between different teams of observers and theoreticians to both improve the modelling of the physics of the 21cm signal and perform adequate reduction of the raw observational data in order to provide constraints on the 21cm power spectrum.