Chapter01b-1 - The Earth and Its Atmosphere: Chemical...

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The Earth and Its Atmosphere: Chemical composition and vertical structure
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RECAP Definition of an atmosphere: the gas surrounding a planet/satellite/comet/… Origin of the atmosphere. Three stages:  I  - gravitational capture of the gasses in the proto planetary nebula of the Sun  (mainly H 2 , He); II   - outgassing of the planet (volcanoes, geysers,…); formation of an ocean  (perhaps?);   material from meteorites and comets; III  – evolution of the atmosphere due to the presence of life and human activity. The early atmosphere of the Earth is very different from the atmosphere today!  We learn about the formation and the evolution of the Earth’s atmosphere from the  Earth’s geological records and by studying other planets. The role of the atmosphere: protection from UV and cosmic rays, shields us from  meteorites, decreases the day/night temperature variations… 
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Planets in the Solar System Definition of a planet: a celestial body which is in orbit around the sun has sufficient mass for its self-gravity to overcome rigid body forces  so that it assumes a . .. nearly round shape has cleared the neighborhood around its orbit Pluto disqualified since orbit overlaps with Neptune's.
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The Gainesville Solar Walk Along NW 8 th  Ave from 34 th  St. to 22 nd  St. Alachua Astronomy Club (AAC) says
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Chapter01b-1 - The Earth and Its Atmosphere: Chemical...

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