The MOON (Majorana/Mo Observatory Of Neutrinos) project aims at studies of the Majorana nature of the neutrino (v) and the v-mass spectrum by spectroscopic experiments of neutrino-less double beta decays (0vbetabeta) with the v-mass sensitivity of < mvm > = 100-30 meV. The solid scintillator option of the MOON detector is a super ensemble of multi-layer modules, each being composed by PL scintillator plates and position-sensitive detector planes with good overall energy resolution of sigma approx 2% at the Qbetabeta approx 3 MeV. Thin betabeta source films are interleaved between the detector planes. High localization of the two beta tracks enables one to select true signals and reject BG ones. The multi-layer structure of the detector makes it realistic to build a compact ton-scale detector. MOON with detector not = betabeta source is used for studying 0vbetabeta decays from 100Mo, 82Se and other betabeta isotopes with large Qbetabeta. Real-time exclusive measurements of low energy solar neutrinos can be made by observing inverse beta rays from solar-v captures of 100Mo in delayed coincidence with the subsequent beta decay of 100Tc.