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What do you think of when you look at the night sky?

What do you think of when you look at the night sky?. http://www.astro.ufl.edu/~lada/ast3018/lectures/ast3018lecturestarform.pdf. What is Space?. Not really empty Stars, planets, etc. Interstellar medium Dust and Gas Nebulas. Orion Nebula

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What do you think of when you look at the night sky?

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  1. What do you think of when you look at the night sky? http://www.astro.ufl.edu/~lada/ast3018/lectures/ast3018lecturestarform.pdf

  2. What is Space? • Not really empty • Stars, planets, etc. • Interstellar medium • Dust and Gas • Nebulas Orion Nebula http://hubblesite.org/gallery/album/nebula/pr1995044a/ Large Magellanic Cloud http://hubblesite.org/gallery/album/nebula/pr2006055a/

  3. Nebular Hypothesis • Random collisions of atoms • Areas of growing mass • Spherical shape • Pull in more matter • Increase in • Temperature • Pressure • Spin • Creates a bulge in the sphere http://physics.uoregon.edu/~jimbrau/BrauImNew/Chap06/FG06_17.jpg

  4. Nuclear Fusion • High temperatures • 2 particles become 1 • Releases a lot of energy • Video clip • Particle accelerators • Man-made • Create new elements • Find smallest particles http://www.universetoday.com/52696/nuclear-fusion-power-closer-to-reality-say-two-separate-teams/ Fermi National Lab http://www.wired.com/playbook/2012/08/olympics-physics-hammer-throw/

  5. Spectroscopy Activity • Draw the lines that you see • Make sure the # of lines, color of the lines and order is accurate • Write a conclusion – based on your observations what can you conclude about the different materials and light you see the material produce

  6. Warm Up #1 • Clicker Quiz • Compare conclusions from the spectroscopy activity • Turn in your research topic

  7. What does a spectrum tell us? • Each chemical/atom has a unique spectrum • Like a fingerprint • What chemicals are present http://www.umsl.edu/~physics/Lab%20Connection/Electricity%20and%20Magnetism%20Lab/12-lab13.html

  8. How is a spectrum created? • All objects emit light • Pure light from a source • Continuous spectrum • If light passes through gas or dust • Light absorbed • Excites/heats atoms • Emit own light • Makes an emission spectrum • Unique https://www.cfa.harvard.edu/~jbattat/a35/cont_abs_em.html

  9. How do astronomers use spectra? • Look at light from • Stars (gas in outer layers) • Nebula • Determine chemical composition • Can also determine movement of object • Activity http://www.eso.org/public/outreach/eduoff/cas/cas2004/casreports-2004/rep-236/

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