  The JUNO observatory, a 20 kt liquid scintillator detector to be completed in
2022 in China, belongs to the next-generation of neutrino detectors, which
share the common features of having a multi-ton scale and an energy resolution
at unprecedented levels. Beside the ambitious goal of neutrino mass ordering
determination, the JUNO Collaboration plans also to perform a wide series of
other measurements in the neutrino and astroparticle fields, rare processes and
searches for new physics. The detector characteristics will allow the detection
of neutrinos from many sources, like supernovae, the Sun, atmospheric and
geoneutrinos. Other potential studies accessible to JUNO include the search for
exotic processes, such as nucleon decays, Dark Matter and magnetic monopoles
interactions, light sterile neutrinos production. This work reviews the physics
potential of JUNO about non-reactor neutrino sources, highlighting the unique
contributions that the experiment will give to the various fields in the
forthcoming years.
