Venters, ToniaToniaVentersHamaguchi, KenjiKenjiHamaguchiBrandt, Terri J.Terri J.BrandtAjello, MarcoMarcoAjelloBlumer, HarshaHarshaBlumerBriggs, MichaelMichaelBriggsCoppi, PaoloPaoloCoppiD'AMMANDO, FILIPPOFILIPPOD'AMMANDODe Becker, MichaelMichaelDe BeckerFields, BrianBrianFieldsGuiriec, SylvainSylvainGuiriecHewitt, John W.John W.HewittHumensky, BrianBrianHumenskyHunter, Stanley D.Stanley D.HunterLI, HUIHUILILien, Amy Y.Amy Y.LienLongo, FrancescoFrancescoLongoMcEnery, JulieJulieMcEneryOjha, RoopeshRoopeshOjhaPavlidou, VasilikiVasilikiPavlidouPrescod-Weinstein, ChandaChandaPrescod-WeinsteinSantander, MarcosMarcosSantanderTomsick, John A.John A.TomsickWadiasingh, ZorawarZorawarWadiasinghWalter, RolandRolandWalter2020-12-302020-12-3020192330-9458http://hdl.handle.net/20.500.12386/29320This white paper is the first of a two-part series highlighting the most well-known high-energy cosmic accelerators and contributions that MeV astronomy will bring to understanding their energetic particle phenomena. The paper discusses galactic cosmic rays, supernova remnants, protostellar jets and superbubbles, and colliding wind binaries.ELETTRONICOenArticlehttps://baas.aas.org/pub/2020n3i396/release/12019BAAS...51c.396VFIS/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