Intro to Solar system Notes October 23 2007

Intro to Solar system Notes October 23 2007 - Intro to...

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Intro to Solar system Notes 10/23/07 Origin of the planets: All planets are orbiting the sun in the same direction (counter clockwise) All planets are on the same plane (their tilts are all small) The moons orbiting certain planets orbit counter clockwise Each individual planet turns on its own axis Almost all the planets turn on their axis counter clockwise (Venus turns clockwise) (Uranus turns sideways) Two handed rule: Right hand rule- let your thumb point north and let your fingers show where your fingers are pointing. (counter clockwise) Left hand rule- same process (clockwise rule) Uranus- rotates according to it left hand rule tipped 83 degrees. According to the right hand rule Uranus tips 97 degrees. Sun- rotates on its axis according to the right hand rule (density of 1) Saturn(density lower than 1), Neptune, Uranus, Jupiter: have low density 1 or lower. D=m/v (Density less than 1 floats in water) Mecury, Venus, Earth, mars,: have high densities (5-6) (hard rock planets) Fact/theory/belief Fact: data that is gathered on a topic Belief: base your decision on a statement, feeling or emotion Theory: model or outline of how something works that can be tested against the facts Law: a well tested theory Theory of Stellar evolution (How stars are formed): Start with a basic atom (Hydrogen) make the even distributions concentrated in one area. This causes a concentration in the area and thus would pull all of the surrounding hydrogen atoms toward the concentration. Eventually you’ll get a large ball and gravity is compressing the ball making it hot in the center. This would cause protons to collide and bond with one another
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causing an atom to have two protons (helium). This changes the mass of the atom, the little bit of mass that disappears changes into energy (E=MC^2). The excess energy makes it even hotter in the center making the protons collide even faster the hydrogen fusion. This causes hydrogen explosion. The stars outer material covers the explosion. You have a star. Over time the Hydrogen runs out and the fusion stops. The helium ball begins to get hotter and the helium nuclei(six protons) bond (helium fusion) now carbon is made. This results in the loss of mass the process goes through the cycle until Iron element is reached. Once iron is formed this will cause the star to explode supernova. Explosion lets off excess elements which form other stars. All of the elements have gone through at least one supernova. Supernova- when a star explodes All the elements trace their roots all the way back to star stuff. 10/25/07 Planets The cloud of debris, gravitate inward. o The star is spinning inward (hot center surrounded by gas) o Planetessimalls surround the outer disk and are pulled together to form a planet. o
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This note was uploaded on 04/07/2008 for the course ASTR 121 taught by Professor Tolbert during the Fall '08 term at UVA.

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Intro to Solar system Notes October 23 2007 - Intro to...

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