GLGY 209 Lecture Notes - Lecture 3: Eagle Nebula, Orion Nebula, Marae
27 May 2016
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Document Summary
Nebulae are concentrations of interstellar gas and dust. The are formed through a variety of processes: Explosion of a star or other celestial body; Collision between two or (rarely) more celestial bodies. The eagle nebula is probably one of the most spectacular we know. It consists of dust, gases (e. g. , hydrogen, helium) and, probably, vapors, which are often referred to as interstellar fog . This nebular is regarded as a typical example for the birthplace of stars . The stars are massive celestial bodies consisting on ionized gas. Their mass is so big, so they are permanently in danger of shrinking. The sun radiates energy due to the continuous thermonuclear reactions at its interior. The thermonuclear reactions combine atoms of hydrogen to form helium. The lifecycle of a star depends of how long its hydrogen reserve lasts. The sun accounts for approximately 98. 8 % of the total mass of the solar system.
