Chapter 24.3 Notes Our Sun 24.3 Vocabulary Review •  Photosphere – Visible surface of the sun. •  Chromosphere – Second layer of solar atmosphere. •  Corona – Outer layer of the atmosphere. Considered the hoBest temperatures on the sun. •  Core – where nuclear fusion takes place. •  RadioacDve zone – about 61% of the sun. 24.3 Vocabulary Review •  Solar Wind – Created in corona as gas flows outward from the sun at high speeds. 24.3 Vocabulary Review •  Prominence – Arc of gas that is ejected from chromosphere and then goes back to the sun’s surface. 24.3 Vocabulary Review •  Solar Flare – Violent erupDons from the surface of the sun. 24.3 Our Sun 6.  Explain the structure of the sun 1) 2) • 
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3) 4) 8) 9) 5) 10) 6) 7) ConvecDon Zone RadiaDon Zone Prominence Sunspot Corona Photosphere Chromosphere Core Filament Coronal Hole 24.3 Our Sun 6.  Explain the structure of the sun 1) Prominence 2) Corona 3) Photosphere 4 Sunspots 8) Core 9) RadiaDon Zone 5) Chromosphere 10) ConvecDon Zone 6) Filaments 7) Coronal Hole 24.3 Vocabulary Review •  ConvecDon Zone – CirculaDon of gases. Hot gases rise while the cool gases sink. This creates a cycle that brings the light rays to the surface. Sun Facts •  The sun is 330,000 Dmes more massive than Earth. •  About 70% Hydrogen & 28% Helium. •  It takes about 170,000 years for the energy to reach the surface from the core. 24.3 Our Sun 7.  Explain how the sun produces energy. A.  Nuclear Fusion – Four Hydrogen nuclei fuse to form a helium atom. B.  Energy is released because some maBer is actually converted into energy. I. 
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Hydrogen atom mass = 1.008 amu Helium atom = 4.003 amu (1.008 amu x 4 hydrogen atoms) = 4.032 amu 4.032 amu (4 hydrogens) – 4.003 amu (Helium) = 0.029 energy released. V.  This energy is extremely powerful. Many Dmes more powerful than an atomic bomb. 24.3 Our Sun 7.  Explain how the sun produces energy. A.  Nuclear Fusion