Week 2 Lecture Notes
Week 2 Lecture Notes ASTR 121
Popular in ASTR 121 The Solar System
Popular in Astronomy
This 4 page Class Notes was uploaded by Anisa sudra on Thursday April 9, 2015. The Class Notes belongs to ASTR 121 at University of Oregon taught by Scott Fisher in Spring 2015. Since its upload, it has received 125 views. For similar materials see ASTR 121 The Solar System in Astronomy at University of Oregon.
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Date Created: 04/09/15
Astronomy Lecture amp Book Notes 04032015 Friday 4315 LECTURE NOTES 0 Science is not static it s a process Telescope Gemini 0 Computerized vent gates for windweather conditions Built by RSF and colleagues Gives views of astronomical objects we cannot obtain our eyes 0 Used to study the interstellar medium and dust disks around stars 0 IR longer wavelength than visible light 0 IR cameras like OSCIR see wavelengths 20 times longer than we see 0 Like seeing quotheat wavesquot 0 Our eyes only see a little bit of the spectrum the colored part 0 Oscir sees the infrared part of the spectrum 0 What we see and oscir sees are extremely different Oscir sees what s inbetween stars This camera is sensitive to what these things emit a Orion photo example Dust grains gas etc 0 Different types of telescopes see different parts of the spectrum 0 Everything emits radiation and the temperature of the object determines how it will emit DESCRIBED BY THE PLANCK FUNCTION 0 Our eyes generally see about 10000 degrees f oscir camera can see about 100 degreed f infrared Interstellar medium is the gas and dust that exists between the stars 0 Many of the space pictures are of this 0 Looks dense but is very very diffuse MONDAY 4615 11 our modern View of the universe goals 0 what is our place in the universe 0 How did we come to be 0 How can we know what the universe was like in the past 0 Can we see the entire universe the distance light can travel in 1 year its not a year it s a distance 0 About 6 trillion miles 10 trillion km 0 1 parsec 325 light years 0 light travels at a xed speed 0 We look at it on a relative scale Not absolute scale quotcosmic addressquot 0 earth is our home in the solar system look at opening graphic in the textbook scaleofuniversecom powers of 10 a large glowing ball of gas that generates heat and light through nuclear fusion 0 Fusion in the sun is how it generates its energy how it warms the earth 0 solar prominence eruptive events from the sun 0 they are pointed towards earth and make an aurora o A strong prominence will be bad for the earth 0 Stereo satelite satellite pointed at the sun 0 109 earths will fir across the diameter of the sun diameter of autzen stadium approx 109 of you 0 the surface of the sun is called the photosphere You cannot stand on the sun The temperature of the surface is 5800 K o The mass of the sun is roughly 330000 earths o The distance to the sun is 93000000 miles Equal to 8 lightminutes how fast light can move in a minute your eyes are passive light you are seeing is in the past Also called 1 astronomical unit a moderately large object that orbits a star it shines by re ected light look at Cassini homepage o Primarily made of hydrogen like other gas giants Rings are made of dry ice and pebbles O WEDNESDAY 4815 a moderately large object that orbits a star THAT IS NOT THE SUN 0 May be rocky icy or gaseous in composition 0 The rst exoplanets were discovered in the 1990 s 0 We now know about 1800 planets around other stars 0 As time progresses more and more planets will be discovered around stars 0 Current theories suggest that approximately 20 15 of stars in our galaxy have planets o All are too far away to see detail Which means that they re only quotdots on imagesquot for now 0 The discovery of these completely changes our quotplace in the universequot again We know that the solar system is one of many planetary systems 0 This will be one of the de ning discoveries of our generations time o The moon vs the usa 0 Diameter of the moon 2100 miles 0 Diameter of the earth 7900 miles 0 Earth is about 4x bigger than the moon 0 450 tons 14 years of continuous human occupation orbits the earth about 200 miles up 0 about the distance from Eugene to seattle 0 watch ISS timelapse 0 An object that orbits a planet or dwarf planet 0 A moon of Saturn ENCELADUS 0 Water ice fountains geysers These suggest that it might have liquid water below the surface and maybe life 0 Along with Europa moon ofJupiter are excellent places to search for extraterrestrial life 0 APRIL 4th cassini detects enceadus ocean 6 mile deep underground ocean of liquid water we measured what the density of the moon due to its gravity moving the spacecraft This could only happen with the presence of water relatively small and rocky object that orbits a star 0 Between mars and Jupiter 0 They are a quotfailed planetquot Ceres is the largest 600 miles in diameter 0 quotnear earthquot asteroids ones who have orbits that quotcrossquot the orbit of earth a relatively small and icy object that orbits a star 0 The ice allows the comet to form the tail of the comet