  RNO is the mid-scale discovery instrument designed to make the first
observation of neutrinos from the cosmos at extreme energies, with sensitivity
well beyond current instrument capabilities. This new observatory will be the
largest ground-based neutrino telescope to date, enabling the measurement of
neutrinos above $10^{16}$ eV, determining the nature of the astrophysical
neutrino flux that has been measured by IceCube at higher energies, similarly
extending the reach of multi-messenger astrophysics to the highest energies,
and enabling investigations of fundamental physics at energies unreachable by
particle accelerators on Earth.
