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How Do Stars Form?. Galaxies of Stars. The Sun. By far the nearest star to earth. A star is a large self-luminous body in space that creates its own radiant energy. It gets its energy from nuclear fusion
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How Do Stars Form? Galaxies of Stars
The Sun • By far the nearest star to earth. • A star is a large self-luminous body in space that creates its own radiant energy. • It gets its energy from nuclear fusion • During fusion under conditions of extreme heat and pressure in the star, the nuclei of two hydrogen atoms join to form a single helium nucleus.
The Sun • Nuclear fusion reaction produces a huge amount of energy • Fusion reaction in larger stars such as red giants produce heavier elements such as carbon, oxygen, and iron • The formation of the heaviest natural elements requires the conditions found only in massive stellar explosions.
Orion Nubula • A nubula (from Latin: "cloud";pl. nebulaeor nebulas) is an interstellar cloud of dust, hydrogen gas, helium gas and other ionized gases. • The Orion Nebula (also known as Messier 42, or M42) is a diffuse nebula situated southof Orion's Belt. It is one of the brightest nebulae, and is visible to the naked eye in the night sky. M42 is located at a distance of 1,344 ± 20 light years[3][6] and is the closest region of massive star formation to Earth. The M42 nebula is estimated to be 24 light years across.
Stellar Mass Ejection • Is a phenomenon observed in some massive stars causing the ejection of a large portion of the star's mass.
Betelgeuse Rigel
