astro oct 10th.docx

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Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Michael Reid
Semester
Fall

Description
Astro 10th,2013 Best way to study mid terms is do assignments on mastering astronomy, and quiz your self. on mastering astronomy theres a menu on side that says self study area, hundred of question and little activities to do on your own to prepare for the best, to give you extra boost closer to mid term, oct 18 and 21 were offering review sessions. note those days. end of last class we were talking about how the sun powers it self we went through whats called pro ton proton change nuclear reactions sun uses to convert hydrogen and turn it into helium and inso doing it changes what kind of thing it to another kind of thing, it changes matter or mass in to energy. sun takes matter and converts it into energy, does it through wants called a fusion reaction. -centre of sun is 15million degrees hot, had to be that hot so it can stick protons together, hydrogen atoms, if you stick protons together what do they normal do. its to repel similar electric chares repel. in order to get them to fuse, they have to move at incredible speeds, so they can push through mutual repulsion. temperature is the description of how fast particles are moving around in physics. sun its core particles moving fast enough they can smash in to each other and stick. approximately how hot is the sun all of the above, the temperature changes at different points of the sun. this is the temperature of the core 15000000 from the surface going into the core you pass through all these temperatures, sun has many, many temperatures. -The SOLAR THERMOSTAT stabilizes energy production in the core. -sun is a giant ball of plasma own gravity wants to squish it and turn it into a black hole, it hasn't happened. sun produces tremendous amount of heat, it produces outward pressure that balances force of gravity. sun its a gas everything around it moving around really quickly, sun can get hotter inside, or a little colder, depending on how stuff moves around, for 5 billion years its managed to maintain its temperatures through what is called the solar thermostat if a temperature gets to high air condition go in to low heater kick up. -im showing you half of a diagram written in your textbook, you can work with solar thermostat working with an increase or decrease in temperature, lets say for whatever reason in the core of the sun the temperature starts to fall , the protons in the core of the sun start to slow down, and they need to move quickly so they can stick to one another, so they can fuse, if their is a cooling the rate of protons stick together slows down, the more protons that encounter each others and don't stick is the less energy you get, the less energy you get, the less outward pressure in the sun, the less outward pressure you have, the more gravity starts to win, if gravity starts to win, it compresses the sun again, compressing the sun drives proton closer and closer together, makes it more likely they stick and it produces more energy and drives sun back to original configuration, with out which life would be impossible in the universe. complicated sequence of steps core temperature stops protons slow down fusion rate drops energy production go down, the pressure go down, and everything starts to collapse gravity starts to win, as gravity collapse things, bring protons closer together energy generation rate go up and sun re expands to original size, expan
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