WEEK 4 LECTURE NOTES
WEEK 4 LECTURE NOTES ASTR 121
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This 4 page Class Notes was uploaded by Anisa sudra on Thursday April 23, 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 109 views. For similar materials see ASTR 121 The Solar System in Astronomy at University of Oregon.
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Date Created: 04/23/15
WEEK 4 42315 437 PM MONDAY 42015 exam 1 chapter 1 all info on the class slides anything emphasized in class format multiple choice short answer fill in blank short writing atmosphere is 60 miles away 12 the scale of the universe a scaled solar system 0 is one of about 100 billion galaxies in the observable universe 0 roughly 10000 particles 0 area of the sky is 110 of the size on the full moon 0 Took HST about 11 days to observable this deep 0 Selected to be the emptiest part of the sky 0 A scale on which we compress the history of the universe into 1 yeah There are roughly the same amount 13 spaceship earth 0 Earth rotates on an axis gt600 mileshr Earth orbits the sun gt60000 mileshr 0 Solar system moves among stars N 45000 mph Milky way rotates N 5000000 mph Milky way moves in local groups Universe expands Chapter 2 Discovering the universe for yourself HW 3 0 We measure the sky using angles o The angle it subtends at a given distance 0 It is not constant angular size decreases with distance 0 An size is how big it is o Is constant and does not change o the true and angular size of the moon stays the same whether or not it is near your horizon The illusion is your brain helping you by doing what it thinks is best making the moon match the things that it sees as next to it o A region of thy sky 0 88 constellations fill the entire sky 0 The shapes are actually called asterisms aka constellations 0 stars at different distances all appear to lie on the celestial sphere o Allusion that we live under a dome of the sky and its 88 constellations StarsconstelIationsclusters are not flat All are 3D 0 Is the sun s apparent path through the celestial sphere The 88 constellations cover the celestial sphere WEDNESDAY 42215 Picture of the day comet cG 67P taken from Rosetta spacecraft 0 Why do stars rise and set 0 Earth rotates west to east so stars appear to circle from east to west o Coordinates position north or south of equator position east of west of prime meridian runs thru Greenwich England astronomy was a big thing in England in the 18005 n EUGENE N 44 W 123 Direction angle of stars changes the further you go from the equator n Depends on where the person is standing the latitude n Example on the equator the star trails are straight updown Stars near the north and south pole are called circumpolar and never set This means that they never go below your local horizon 0 Why do the constellations we see depend on the latitude and time of year 0 They depend on latitude bc your position on earth determines which constellations remain below the horizon 0 They depend on time of year bc earth s orbit changes the apparent location of 0 As earth orbits the sun the sun appears to move w respect to the stars 0 What does the universe look like from the earth 0 W the naked eye we can see more than 2000 individual stars as well as the milky way The light from the milky way is the combined light of millions of stars in the disk of our galaxy 23 the moon our constant companion 0 what causes eclipses o The earth and moon cast shadows 0 When either passes through the other s shadow we have an 0 Solar eclipse moon in front of sun Eclipses recue with the 18 year 11 13 but the type of eclipse and the location may vary
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