Extragalactic Star Formation  The study of how stars form under
various chemical and physical conditions in the Universe is
crucial in order to get better insights on how larger structures
such as galaxies form and evolve in time.  Stars form in dense
condensations of gas. It is thus important to determine as
precisely as possible the properties of this gas (e.g. gas
temperatures and pressures), and especially how they vary from
one galaxy to another.  Galaxies vary in type and
characteristics: some experience a burst of star formation
activity in their nucleus, some are are quiescent, some are
merging (see Figure 1), some host black holes in their central
region.  All these different environments directly influence the
properties of the gas and thus the way stars are forming within
it.  guintet High-redshift radio galaxies 3 cropped   Galaxy
Evolution from Surveys High-redshift radio galaxies   NASA
Hubble Space Telescope Image of the Antennae Galaxies (NGC 4038
& 4039) Spiral NGC6946   Antennae Galaxies Sta