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Theoretical consideration shows that impacts of comet nuclei with the Sun are accompanied by generation of hot plasma and strong "blast" wave due to "explosion" of high-velocity comet nuclei during their impulse aerodynamic deceleration in a relatively very thin sub-photosphere layer. High-resolution observations of high-temperature phenomena near the solar surface are of interest for the physics/prognosis of solar flares as well as physics of comets // IAU 28th GA, Scientific Session SpS6: Science with large solar telescopes.