  Aside from its primary purpose of shedding light on the mass hierarchy (MH)
using reactor anti-neutrinos, the JUNO experiment in Jiangmen (China) will also
contribute to study neutrinos from non-reactor sources. In this poster we
review JUNO's goals in the realms of supernova, atmospheric, solar and
geo-neutrinos; present the related experimental issues and provide the current
estimates of its potential. For a typical galactic SN at a distance of 10 kpc,
JUNO will record about 5000 events from inverse beta decay, 2000 events from
elastic neutrino-proton scattering, 300 events from neutrino-electron
scattering, and the charged current and neutral current interactions on the
${^{12}}{\rm C}$ nuclei. For atmospheric neutrinos, JUNO should be able to
detect $\nu_e$ and $\nu_\mu$ charged current events. Optimistically, a
determination of the MH could be achieved at the 1.8$\sigma$ (2.6$\sigma$)
level after 10 (20) years of data taking. JUNO will also study solar neutrinos
from ${^{7}}{\rm Be}$ and ${^{8}}{\rm B}$, at low ($\approx$1 MeV) and higher
energies respectively, to improve our understanding of the matter effects on
the oscillation mechanism and of the solar metallicity. Challenges come
primarily from the radioactive and cosmogenic backgrounds: the expected
performance for two benchmark scintillator radio-purities, are shown. The flux
of geo-neutrinos gives us an insight on the Earth composition and formation. We
will show how the increased sample size given by JUNO's large sensitive mass of
20 KTon liquid scintillator will provide data to answer to several geological
questions among which the U/Th ratio and mantle measurements.
