Earth Our Water Home (HWRS170A)
Earth Our Water Home (HWRS170A) HWRS 170A
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This 2 page Class Notes was uploaded by Eilidh Notetaker on Sunday January 24, 2016. The Class Notes belongs to HWRS 170A at University of Arizona taught by J Washburne in Spring 2016. Since its upload, it has received 33 views. For similar materials see Earth our Watery Home in Natural Sciences at University of Arizona.
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Date Created: 01/24/16
January 21, 2016 Scale of Universe 1 light year= 3 x 10^8 m/s x dust may be responsible for early report of Big Bang gravity waves 90% of the human body is made up of: o hyrdogen o oxygen o carbon gravity is force recognized as starting Big Bang Life Cycle of Stars stars vary in size, age o giant stars are brighter than the sun, but burn out fast o giant stars burn out in 1020 million years o intermediatesized stars such as the sun will last approx. 10 bullion years stars are in dynamic equilibrium o force of gravity=inward o force of radiation/fusion=outward sun will collapse when hydrogen is used up o results in temporary temp rising and expansion (form red giant star) o higher temps would fuel more fusion, converting helium to carbon fusion would end when helium used up o loss of heat of fusion would form a smaller white dwarf star that will cool to a black dwarf star giant stars collapse over multiple stages o collapsing forms increasingly complex elements (i.e. carbon> oxygen) o supernova: a massive explosion that fuses heavier elements together and blasts them through the universe (final stage) (Know how to draw the life cycle of the sun) How did it get started, how will it end? Formation of Planets when stars form they are surrounded by a rotating disk of cosmic debris gravity pulls the debris together to form planets that revolve in a consistent direction around star o heaver, rocky planets closer to the sun o lighter, gasrich planets farther away potentially thousands or millions of extrasolar planets revolve around other stars Terrestrial Planets (inner planets) composed of rocks divided into compositional layers o crust: composed of lighter elements (silicon, oxygen) o mantle o core: composed of heavier elements (iron, nickel) found in metallic meteorites Jovian Planets (outer planets) large, gas giants much of the volume of the planets is a thick atmosphere overlying oceans of liquid gases many moons and ring systems What About Pluto? Definition of planet had to be changed, or pluto would need to be dropped o too small o did not clear neighborhood around its orbit considered a dwarf planet January 26, 2016 insolation: amount of solar radiation received by Earth
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