Holder, JamieJamieHolderAMATO, ElenaElenaAMATOBANDIERA, RinoRinoBANDIERABird, R.R.BirdBULGARELLI, ANDREAANDREABULGARELLIDwarkadas, V. V.V. V.DwarkadasGiglietto, N.N.GigliettoGoldoni, P.P.GoldoniHinton, J.J.HintonHnatyk, B.B.HnatykHumensky, T. B.T. B.HumenskyInoue, S.S.InoueKaaret, P.P.KaaretLenain, J. -P.J. -P.LenainMarcowith, A.A.MarcowithMORLINO, GIOVANNIGIOVANNIMORLINOMukherjee, R.R.MukherjeeOhm, S.S.OhmPe'er, A.A.Pe'erOng, R. A.R. A.OngOstrowski, M.M.OstrowskiSantander, M.M.SantanderSergijenko, O.O.SergijenkoTibaldo, L.L.TibaldoTorres, D. F.D. F.TorresTothill, N. F. H.N. F. H.TothillVandenbroucke, J.J.VandenbrouckeVorobiov, S.S.VorobiovWilliams, D.D.Williams2021-01-072021-01-0720192330-9458http://hdl.handle.net/20.500.12386/29569This white paper briefly summarizes the importance of the study of relativistic cosmic rays, both as a constituent of our Universe, and through their impact on stellar and galactic evolution. The focus is on what can be learned over the coming decade through ground-based gamma-ray observations over the 20 GeV to 300 TeV range.ELETTRONICOenArticlehttps://baas.aas.org/pub/2020n3i267/release/12019BAAS...51c.267HFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_10 High energy and particle astronomy – X-rays, cosmic rays, gamma rays, neutrinos