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Emission Spectrum Absorption Spectrum Neutron Element Electron Energy Level Atom Star Cooler Gas Photon Nucleus Particle Electron Proton Quarks Nuclear Fusion Strong Nuclear Force Particle Fundamental Proton Neutron Nucleus Join Bigger Fission Protons Neutrons Attractive Nucleus Absolute Zero Sun Protostar -273 Kelvin Kinetic Energy Pressure Earth Solar System Star Light Gas Dust Gravity Planets Red Giant Black Hole Super Nova Sun White Dwarf Mass Planetary Nebula Super Nova Light Gravity Super Giant Explosion Black Hole Neutron Star Mass Cepheid variables Red Giant Expand Contract Stars Diameter Hydrogen Helium Small Mass Nucleus Photosphere Core Atom Protons Middle Neutrons Surface Layer 5500K Convective Outside Hottest Middle Nuclear Fusion 14,000,000K Radiative Zone Convective Zone E=mc2 Core Convective Zone Photons Energy Radiative Photosphere 1,000,000K Currents Photons Neutron Star Luminosity Packet Radiation Electromagnetic Waves Super Nova Explosion Black Hole Mass Energy Radiated Sun Magnitude Kinetic Model of Matter Temperature Volume Pressure Gas Energy Mass Speed of Light Einstein