Abstract
The multi-object MOSAIC is to be installed at the Extremely Large Telescope (ELT) of ESO. It is a complex instrument, consisting of 6 spectrographs, 4 near-infrared (NIR) and 2 optical spectrographs, operating at two resolutions of R~5,000 and 20,000, and can be used simultaneously in the NIR and optical. Phase A (Conceptual Design) was approved by ESO, and in 2023 it entered in Phase B, …