Supernovae (SN) and supernova remnants (SNR) have key roles in galaxies,
but their physical descriptions is still incomplete.
Thus,
it is of interest to study neutrino radiation to understand SN and SNR better.
We will discuss: (1) The
10 MeV thermal neutrinos that arise from core collapse SN,
that were observed for SN1987A,
and can be seen with several existing or planned experiments.
(2) The 10-100 TeV neutrinos expected from galactic SNRs (in particular from RX~J1713.7-3946) targets of future underwater neutrino telescopes.
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